India is the birth place of four of the world's major religious traditions; namely Hinduism, Jainism, Buddhism and Sikhism. Throughout its history, religion has been an important part of the country's culture. Religious diversity and religious tolerance are both established in the country by law and custom. A vast majority of Indians associate themselves with a religion.Zoroastrianism and Judaism also have an ancient history in India and each has several thousand Indian adherents. India has the largest population of people adhering to Zoroastrianism and Bahá'í Faith anywhere in the world. Many other world religions also have a relationship with Indian spirituality, like the Baha'i faith which recognizes Lord Buddha and Lord Krishna as manifestations of God Almighty.

The Constitution of India declares the nation to be a secular republic that must uphold the right of citizens to freely worship and propagate any religion or faith (with activities subject to reasonable restrictions for the sake of morality, law and order, etc.). The Constitution of India also declares the right to freedom of religion as a fundamental right.

Citizens of India are generally tolerant of each other's religions and retain a secular outlook, although inter-religious marriage is not widely practiced. Inter-community clashes have found little support in the social mainstream, and it is generally perceived that the causes of religious conflicts are political rather than ideological in nature.

Hinduism is often regarded as the oldest religion in the world, with roots tracing back to prehistoric times or 5000 years. Evidence attesting to prehistoric religion in the Indian "subcontinent" derives from scattered Mesolithic rock paintings depicting dances and rituals. Neolithic pastoralists inhabiting the Indus River Valley buried their dead in a manner suggestive of spiritual practices that incorporated notions of an afterlife and belief in magic. Other South Asian Stone Age sites, such as the Bhimbetka rock shelters in central Madhya Pradesh and the Kupgal petroglyphs of eastern Karnataka, contain rock art portraying religious rites and evidence of possible ritualised music.

The Harappan people of the Indus Valley Civilization, which lasted from 3300-1700 BCE and was centered around the Indus and Ghaggar-Hakra river valleys, may have worshiped an important mother goddess symbolising fertility. Excavations of Indus Valley Civilization sites show seals with animals and "fire‑altars", indicating rituals associated with fire. A linga-yoni of a type similar to that which is now worshiped by Hindus has also been found.

Hinduism's origins include cultural elements of the Indus Valley Civilization, the Vedic religion of the Indo-Aryans, and other Indian civilizations. The oldest surviving text of Hinduism is the Rigveda, produced during the Vedic period and dated to 1700-1100 BCE.γ[›][17] During the Epic and Puranic periods, the earliest versions of the epic poems Ramayana and Mahabharatawere written roughly from 500-100 BCE,[18] although these were orally transmitted for centuries prior to this period.[19]

After 200 CE, several schools of thought were formally codified in Indian philosophy, including Samkhya, Yoga, Nyaya, Vaisheshika, Purva-Mimamsa and Vedanta.[20] Hinduism, otherwise a highly theistic religion, hosted atheistic schools; the thoroughly materialistic and anti-religious philosophical Cārvāka school that originated in India around the 6th century BCE is probably the most explicitly atheistic school of Indian philosophy. Cārvāka is classified as a nastika ("heterodox") system; it is not included among the six schools of Hinduism generally regarded as orthodox. It is noteworthy as evidence of a materialistic movement within Hinduism.[21] Our understanding of Cārvāka philosophy is fragmentary, based largely on criticism of the ideas by other schools, and it is no longer a living tradition.[22] Other Indian philosophies generally regarded as atheistic include Classical Samkhya and Purva Mimamsa.

the answer will not end here. any way India is a fertile land for all major world religions. from the oldest to newest which is or may be born yesterday. anyway Hinduism has its root deep from 10,ooo BCE. though no written history can be shown. but astronomical implications in many vedas points out the above fact. i am proud to be an Indian. I am proud to be a part of oldest existing religion in the world eventhough for the past 1000 years christians and Muslims from outside conquered and suppressed us in various forms.

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