The largest gathering is hajj of Muslims in Saudi Arabia. Every year nearly 3 million people gather at the holy place and perform many rituals.
Muslim Hajj, every year, 3.5 milion
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Vedas
In January 2007, more than 70 million Hindu pilgrims from around the world gathered at Allahabad (also known as Hindu holy city of Prayaga) in India for the Ardh Kumbh Mela, the world's largest religious festival and also the world's largest gathering.It is HAJJ. Yes, its only HAJJ.Actually, It was in 2007, Hindus gathered at a holy tirtha for the Kumbha Mela. at least 80 million Hindus gathered to bathe at Prayag, on a riverside near Allahabad.
2012 in Chino, California, had five flying together for a formation picture. It was the largest gathering of P-38's since the 1950's.
The biggest religious gathering in the world is the Kumbh Mela, a Hindu pilgrimage held every 12 years at four rotating locations in India. Millions of devotees gather to bathe in sacred rivers, believing it cleanses them of sins and facilitates spiritual liberation. The event attracts an estimated 30 million attendees on its peak days, making it the largest peaceful assembly in the world. Its scale and significance highlight the deep cultural and spiritual traditions of India.
The largest religious monument in the world is Angkor Wat in Cambodia, which is a Hindu temple complex originally built in the 12th century.
revival
The largest religious group in the world are Christians. There are over 2,200,000,000 Christians worldwide and the religion is still growing strong. This is almost 1,000,000,000 more than the second largest religion, Islam.
Hinduism description: The major Hindu pilgrimage and temples are discussed here, illustrating their religious significance, and world's largest religious gathering at Kumbh Mela, Hindu religion is uncovered.
Islam - the second largest religion in the world
Angkor Wat