The Bhimbetka rock arts in Central India with rock painting of dancing figures & rituals indicate the religious way of Indian life since the prehistoric era. Similarly, the Harappan people from the Indus valley civilization are believed to have worshipped a female (mother) god as a symbol of fertility.

Hinduism:
Despite being a secular country, more than 80% of Indian population is believed to be Hindus. The Hindus make a majority religion only in India & Nepal. Hinduism is a strange religion for the westerners – a religion that encompasses all diversity with exactly 33 million gods alone. The greatest of all gods are the Trinity – Bramha, the creator; Bishnu, the preserver & Shiva, the destroyer. Hindus are highly ritual people – from birth to death every foreseeable events in human life has been ordered through ritual performance & chanting of mantras. Hindus believe in reincarnation of the soul & burn the dead flesh in the funeral pyre.

Islam:
  Islam is believed to have been brought to India by the Arab trader in 12th century. In the 16th century, India was ruled by the Muslim Mugal rulers, until the British colonial power established itself as the governing force in 17th century. At present, India is the second largest Islamic country in the world.

Christianity:
Many people think that Christianity arrived in Indian with the British Raj. However, although Christianity spread in India after the arrival of European traders in the 15th century, historically Christianity seems to have arrived in India no later than it arrived in Europe.

Sikhism:
Guru Nanak established Sikhism in the 15th century. Sikhs are the natives of the Punjab region. The devout Sikhs wear a turban on their head.

Relgions of India in percentage (approximately)
HINDUISM - 82%  ISLAM - 12%  
CHRISTIANITY -  2.5%
SIKHISM -  2%
BUDDHISM - 0.7%  
JAINISM - 0.5%
ZOROASTRIANISM -  0.01%
JUDAISM - 0.0005%