The five largest religions — Islam, Buddhism, Christianity, Judaism, and Hinduism — represent about 77%of the world's population.
Every year, billions come together to celebrate their faith.
Here are some of the most powerful moments captured in photos in 2017:
Religion practiced around the world in 2017
Hindu priests sit inside a cave as they perform evening prayers on the banks of the river Ganges in Devprayag, India.
A 93-year old Holocaust survivor celebrates the anniversary of his bar mitzvah ceremony in Haifa, Israel.
Artists dressed as Hindu gods Rama and Laxman act as fireworks explode during Vijaya Dashmi, or Dussehra festival celebrations in Chandigarh, India.
A gust of wind blows Pope Francis' mantle during his Wednesday general audience in Saint Peter's square at the Vatican.
A woman prays during the festival of Eid-e-Milad-ul-Nabi, the birth anniversary of the Islamic prophet Mohammad, in Srinagar, India.
A Hindu holy man smeared with ashes sits at the premises of Pashupatinath Temple during the Shivaratri festival in Kathmandu, Nepal.
Bulgarian men jump to catch a wooden crucifix during Epiphany day celebrations in Sofia, Bulgaria.
A man rides a horse through flames during the annual "Luminarias" celebration on the eve of Saint Anthony's day, Spain's patron saint of animals, outside Madrid.
Shi'ite Muslim men in Iraq beat themselves with their hands in mourning for Imam Hussein, a grandson of the Prophet Mohammed who was killed in a 7th Century battle in Kerbala.
REUTERS/Abdullah Dhiaa Al-deen
People gather for Iftar, breaking fast amid damaged buildings during the holy month of Ramadan in the rebel-held besieged town of Douma, Syria.
Worshippers hold candles as they take part in the Christian Orthodox Holy Fire ceremony at the Church of the Holy Sepulchre in Jerusalem.
Devotees occupy Jones bridge as they take part in the annual procession of the Black Nazarene in the Philippines.
A woman dressed up as "Catrina", a Mexican character also known as "The Elegant Death", takes part in a Catrinas parade in Mexico City.
Pilgrims attend a candlelight vigil at the Catholic shrine of Fatima in Portugal.
Young Hindu priests take a holy bath together as part of a ritual during the sacred thread festival at the Pashupatinath temple in Kathmandu, Nepal.
Worshippers in Brazil attend the Day of the Spiritual Indoctrinator annual celebrations at the Vale do Amanhecer (Valley of the Dawn) community.
Muslims pray on a street in front of an illegally built mosque that was destroyed in Belgrade, Serbia.
An Ultra-Orthodox Jewish girl stands in front of a bonfire as she celebrates the Jewish holiday of Lag Ba'Omer in Ashdod, Israel.
Men attend Eid al-Fitr prayers to mark the end of the holy fasting month of Ramadan at a playground in Morocco.
The group Colla els Castellers de Vilafranca form a human tower called 'Castell' during the All Saints Day in a town near Barcelona, Spain.
A snow-covered chapel is covered in crystals after the first snowfall of the season in the western Austrian village of Tulfes.
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