Jessa Seewald's father-in-law slams 'pretender' Josh Duggar in new blog post

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Jessa Seewald's Father-In-Law Slams Josh Duggar's 'Lifestyle of Evil'

Another Duggar in-law is making his distaste for Josh Duggar known.

After the 27-year-old former reality star's brother-in-law, Daniel Keller, publicly slammed him on Facebook last week following his admission that he was "unfaithful" to his wife, Anna Duggar, another of his in-laws is similarly not so quick to forgive. Michael Seewald -- the father-in-law of Josh's 22-year-old sister Jessa Seewald -- calls the former lobbyist both a "pretender" and a "hypocrite" when it comes to his Christian faith, in a blog post titled "Grief, Shame, And Taking the LORD's Name in Vain."

"He claimed to be a Christian, but by his deeds he has suggested otherwise," Michael writes in the lengthy essay posted on Monday. "It distresses me to say that Josh Duggar's greatest sin is a byproduct of the sum total of his secretly sinful lifestyle. That is, that by his hypocrisy, he blasphemed the name of God."

WATCH: Inside Josh Duggar's Possible Christian Rehab Center, Reformers Unanimous

He goes on to slam Josh's "lifestyle of evil," while at the same time publicly professing Christian values.

"With the name of God on his lips he lived a covert and extensive lifestyle of evil," Michael continues. "While proudly saying things like, 'Our family is like the epitome of conservative values,' he was looking at porn and soliciting affairs. He took a job at the Family Research Council that exists to promote the traditional family, all the while undermining his own family by violating his marriage covenant. He flourished in the fame of his family and the success of their television show, all the while betraying their trust and Christian values."

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Josh Duggar and Anna Duggar
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Jessa Seewald's father-in-law slams 'pretender' Josh Duggar in new blog post
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NEW YORK, NY - MARCH 11: Josh Duggar visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: Hilaria Baldwin (R) interviews Josh Duggar and his daughter during their visit with 'Extra' in Times Square on March 11, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NATIONAL HARBOR, MD - FEBRUARY 28: Josh Duggar speaks during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NEW YORK, NY - MARCH 11: Hilaria Baldwin (R) interviews Josh Duggar and his daughter during their visit with 'Extra' in Times Square on March 11, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
NATIONAL HARBOR, MD - FEBRUARY 28: Anna Duggar and Josh Duggar pose during the 42nd annual Conservative Political Action Conference (CPAC) at the Gaylord National Resort Hotel and Convention Center on February 28, 2015 in National Harbor, Maryland. Conservative activists attended the annual political conference to discuss their agenda. (Photo by Kris Connor/Getty Images)
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Josh has since resigned from his position at the Family Research Council following his molestation scandal, and 19 Kids and Counting was canceled in July.

Still, Michael says Josh "brought shame" upon the Christian faith.

"The thing that is so hurtful is that he was a loud voice endorsing Christian ethics and he has been shown to be a fraud," he explains. "I am profoundly grieved that he attained such a platform only to bring shame on God's holy name and the Christian faith."

"Josh was a pretender," he writes bluntly. "True Christians fail often, but their lives are truly being conformed to the image of Christ. Do not look at Josh and justify your own sins by dismissing the reality of genuine faith and a holy God."

Ben Seewald's father notes he feels "deceived" by Josh, after standing by him following his admission in May that he molested five girls as a teenager -- four of whom were his younger sisters. Clearly, he is no longer supporting him.

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Duggar family
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Jessa Seewald's father-in-law slams 'pretender' Josh Duggar in new blog post
TODAY -- Pictured: (l-r) Michelle Duggar and Jim Bob Duggar appear on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 11: AJ Calloway (C) poses with (L-R) Jessa Duggar, Jinger Duggar, Jill Duggar, and Jana Duggar during their visit to 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
TODAY -- Pictured: (l-r) Michelle Duggar, Jim Bob Duggar and Kate Upton appear on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Pictured: (l-r) James Duggar, Michelle Duggar and Matt Lauer appear on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 11: Josh Duggar visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: (R-L) AJ Calloway and Hilaria Baldwin interview Josh Duggar and his daughter during their visit with 'Extra' in Times Square on March 11, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: Hilaria Baldwin (R) interviews Josh Duggar and his daughter during their visit with 'Extra' in Times Square on March 11, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
Two weeks ago I married my best friend! 😘 I love you, Darling! @ben_seewald
It's great living life with your best friend! @ben_seewald
We're expecting!!! So grateful to God for this new little blessing!!! #babydilly #firsttimeparents #sogratefultoGod #derickdillard #jillmdillard
We enjoyed a wonderful family dinner at the Bradford Inn! #familyvacation2014 #19kids #branson
Met Duck Dynasty's Allen & Lisa Robertson tonight!
WASHINGTON, DC - FEBRUARY 10: A view of the book 'A Love That Multiplies' during the Conservative Political Action Conference (CPAC) at the Marriott Wardman Park on February 10, 2012 in Washington, DC. (Photo by Kris Connor/Getty Images)
NEW YORK, NY - OCTOBER 23: Jill Duggar Dillard (L) and husband Derick Dillard visit 'Extra' at their New York studios at H&M in Times Square on October 23, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - OCTOBER 23: (L-R) AJ Calloway interviews Jill Duggar Dillard and husband Derick Dillard during their visit to 'Extra' at their New York studios at H&M in Times Square on October 23, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
GOOD MORNING AMERICA - One of America's largest families, the Duggars, talk about their new book on GOOD MORNING AMERICA, 3/11/14, airing on the ABC Television Network. They are pictured in GMA's Social Square with Dan Harris. (Photo by Ida Mae Astute/ABC via Getty Images) DUGGAR FAMILY, DAN HARRIS
NEW YORK, NY - MARCH 11: The Duggar family visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: The Duggar family visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: AJ Calloway (L) interviews the Duggar family during their visit to 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
WOODBRIDGE, VA - OCTOBER 16: Reality telvision celebrities, Jim Bob Duggar, center, and his wife, Michelle Duggar make a stop on their 'Values Bus Tour' outside Heritage Baptist Church on Wednesday October 16, 2013 in Woodbridge, VA. (Photo by Matt McClain/ The Washington Post via Getty Images)
NEW YORK, NY - MARCH 11: The Duggar family visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: The Duggar family visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: The Duggar family visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: The Duggar family visits 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: (L-R) Jessa Duggar, Jinger Duggar, Jill Duggar, and Jana Duggar visit 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: AJ Calloway (L) poses with Jim Bob Duggar (R) and wife Michelle Duggar during their visit to 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - MARCH 11: Hilaria Baldwin (R) interviews Josh Duggar and his daughter during their visit with 'Extra' in Times Square on March 11, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
TODAY -- Pictured: The Duggar Family appears on NBC News' 'Today show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 11: AJ Calloway (L) interviews the Duggar family during their visit to 'Extra' at their New York studios at H&M in Times Square on March 11, 2014 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
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"Sadly, he had deceived us all," Michael writes. "The name of God has been blasphemed and God is jealous for his name."

WATCH: EXCLUSIVE -- Josh Duggar's Family Speaks Out -- 'I Hope He Gets Broken in Rehab'

Meanwhile, Jessa and Ben were all smiles on Saturday, at their first public appearance since Josh's Ashley Madison scandal. The parents-to-be spoke to the crowd at the Southern Women's Show in Charlotte, North Carolina, and were eager to share details about their first months of marriage, and how they've been preparing for the new addition to the Duggar-Seewald family.

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