Questions, answered with the evidence

Ancient DNA shows that people carrying ancestry from Eurasian steppe pastoralists moved into South Asia in the second millennium BCE, after the Harappan cities declined (Narasimhan et al., 2019). The Rakhigarhi Harappan genome has no steppe ancestry. DNA carries no language, so linking this to Indo-Aryan speech is an inference, strongly favoured with the linguistic evidence. It shows no invasion, and the question remains politically charged.

Partly, and probably, but not in the way often claimed. The Indus civilization (c. 2600–1900 BCE) was not Vedic: it had cities and writing but no horses, while the Rigveda (c. 1500–1200 BCE) knows horses but no cities. Continuity most likely runs through popular religion, such as ritual bathing, pipal veneration and a horned figure among animals. Every specific link is plausible, none is proven, because the Indus script is unread.

Nobody can say, and 'proto-Shiva' cannot be stated as fact. Seal M-304 from Mohenjo-daro, c. 2500 BCE, shows a horned figure seated among wild animals. John Marshall called it a prototype of Shiva as Pashupati in 1931, but the script is unread, the headdress looks bovine, and Shiva's defining traits are first attested 1,500–2,000 years later. It may belong to imagery that later fed into Shiva.

In the Vedic period, roughly 1500–500 BCE, yes: cattle were sacrificed and beef was eaten, and most scholars regard this as well attested. The same texts already show unease. A Brāhmaṇa of c. 900 BCE forbids beef to a consecrated sacrificer, then records a famous sage who ate it anyway. Over the following centuries, ahimsa, Buddhist and Jain pressure and purity rules made the cow inviolable.

There is no fixed number. The Vedas count 33 gods; the popular figure of 330 million comes from reading the Sanskrit koṭi as "ten million"; and an Upanishad of c. 700 BCE reduces them all to one. The number keeps growing because Hinduism grew by adding rather than replacing, over some 3,000 years. Later centuries absorbed local, regional and village deities, and a theology first voiced in the Rigveda, that the many are names of one, let all of them stay.

Neither label fits the whole tradition, because Hinduism contains several theologies laid down over 3,000 years. The Rigveda (c. 1500–1200 BCE) is polytheistic, with hints that the gods are one reality. The Upanishads (from c. 700 BCE) teach monism, one impersonal absolute. From c. 110 BCE Vishnu, Shiva or the Goddess is supreme for devotees, much like monotheism. Many Hindus worship many deities as forms of one.

Only barely. Among 1,028 hymns, the four varṇas appear once: the Puruṣa Sūkta (RV 10.90.12), in Maṇḍala 10, the latest layer, c. 1200–1000 BCE; and it is the only place *vaiśya* and *śūdra* occur. The older hymns show ranking, but not a birth-fixed order. Hereditary subordination is stated in the later Brāhmaṇas (c. 800 BCE) and codified in Dharmaśāstra. What early Rigvedic rank looked like is debated.

The Rigveda's oldest books (Maṇḍalas 2–7) were composed orally c. 1500–1200 BCE on the mainstream dating, with the latest layer, Maṇḍala 10, closer to 1000 BCE. It was not written at all for roughly a thousand years: writing is not attested in India before the 3rd century BCE. The range rests on the Mitanni treaty and the absence of iron; earlier datings exist but are contested.

Nobody founded Hinduism: it has no founder, no founding date and no single moment of origin. Its oldest scripture still in use, the Rigveda, was composed mainly c. 1500–1200 BCE, which makes the tradition roughly 3,500 years old if you date it by its oldest text. Some of its popular religion may be older, reaching back through the Indus cities (c. 2600–1900 BCE) to the Neolithic farmers of Mehrgarh, but those links are plausible rather than proven. Most of what defines Hinduism today arrived later in layers: karma and rebirth c. 700–500 BCE, devotion, images and the first temples c. 200 BCE–300 CE, and stone temples and the Purāṇas c. 300–650 CE. The word 'Hinduism' for one religion appears in English only around 1787. How old it is depends on which of these you count.

No single person wrote the Vedas. The Rigveda's hymns were composed orally over several centuries by many poet-priest families, the rishis, such as the Vasishthas and Vishvamitras; a few hymns are ascribed to women. Priestly schools then compiled them into four collections, Rig, Sama, Yajur and Atharva, and added prose layers. Tradition calls the Veda apaurusheya, not of human making: the seers heard it rather than invented it. Later tradition credits Vyasa with dividing it into four.

Hindus cremate because the funeral is understood as a last sacrifice (antyeshti): the body is offered into the fire, and Agni, the fire god, carries the dead to the ancestors. It was not always the norm. South Asia's earliest farmers and the Indus cities buried their dead, and the Rigveda knows both the burned and the unburned dead. Cremation became standard through later Vedic ritual. Small children and renouncers are still often buried.

Indra, the Rigveda's dominant god with about 250 hymns (c. 1500–1000 BCE), lost his place in stages rather than all at once. The Brāhmaṇas (c. 1000–800 BCE) moved power to the ritual and Prajāpati; the Upaniṣads subordinated all the gods to brahman; the epics made Indra a humbled side character beside Kṛṣṇa; and by the Purāṇic age (c. 300–650 CE) he was one of the guardians of the directions.

The oldest Upaniṣads, the prose Bṛhadāraṇyaka and Chāndogya, were composed c. 700–500 BCE in the Ganga plain. The Taittirīya, Aitareya and Kauṣītaki follow c. 600–500 BCE, and the verse Upaniṣads (Kaṭha, Kena, Īśā, Muṇḍaka, Śvetāśvatara) c. 500–200 BCE. They were composed and transmitted orally. Most scholars date the two oldest before the Buddha; Johannes Bronkhorst dissents.

Karma as moral causation across lifetimes first appears c. 700–500 BCE in the Bṛhadāraṇyaka Upaniṣad (3.2.13), where Yājñavalkya teaches it privately, away from the assembly. It is absent from the Rigveda, the other Vedas and the Brāhmaṇas. Where it came from is contested: development from Vedic ritual thought, kṣatriya circles, or an eastern ascetic culture shared with Buddhists and Jains.

Mainly because non-violence (ahimsa) became a supreme religious value in the centuries after about 500 BCE. Vedic religion sacrificed and ate animals. Jains, Buddhists and other renouncer movements made not harming living beings the measure of virtue, Ashoka banned sacrificial slaughter around 257 BCE, and brahmins adopted vegetarianism as a mark of purity and status. It spread unevenly, so diet still varies by region, caste and community.

Valmiki's Ramayana was composed in stages, roughly between 500 BCE and 300 CE. Books 2 to 6, the story of exile, abduction and war, are the older core; Books 1 and 7 were added later, and they are where Rama is explicitly the god Vishnu. Some scholars put the earliest core a few centuries earlier. Tradition places Rama in an earlier age of the world, but there is no archaeological or textual evidence for a historical Rama.

Between about 200 BCE and 300 CE. The Rigveda (c. 1500–1200 BCE) has no word for a temple or a cult image; worship happened at outdoor fire altars. The first secure evidence is a Mathura relief of an enshrined linga (c. 100 BCE), a temple recorded at Besnagar, and Mathura images of Vasudeva and Balarama. Surviving stone temples begin around 400 CE under the Guptas.

Most scholars date the Bhagavad Gita to roughly 200 BCE–200 CE, a 700-verse dialogue set inside the sixth book of the Mahabharata. Tradition credits the epic to the sage Vyasa; historically the Gita's author is anonymous. Its knowledge of Buddhist ideas, its Samkhya vocabulary and its place in the epic's growth put it after the early Upanishads. Second-millennium-BCE dates are not supported by its language.

Most scholars date the Mahabharata to roughly 400 BCE–400 CE: it was composed and expanded over about eight centuries, growing toward 100,000 verses. Tradition credits it to the sage Vyasa; historically it has no single author, but many generations of anonymous bards and Brahmin redactors. When the text was written and when the Kurukshetra war happened are separate questions. Traditional reckonings tie the war to the start of the Kali Yuga in 3102 BCE; no evidence can confirm that the war took place at all.

Slowly, over roughly a thousand years, not in a single blow. Indian Buddhism depended on monasteries funded by kings and merchants. From the Gupta period (c. 320–550 CE) patronage shifted toward temples and brahmin land grants, Puranic devotion won lay followers, and the Buddha was absorbed as an avatar of Vishnu. The conquests around 1200 destroyed great monasteries that were already the last strongholds.

There was no first Hindu, because Hinduism has no founder and 'Hindu' became a self-description only gradually. The oldest named composers of Hindu scripture are the Rigvedic seer families, c. 1500–1200 BCE. The first person known by name to declare devotion to a still-worshipped Hindu god in stone was a Greek, Heliodoros, c. 110 BCE. People first called themselves 'Hindu' in a religious sense mainly c. 1200–1500 CE.

Not in the simple sense. The traditions are ancient, and a self-conscious Hindu identity is visible by c. 1200–1500 CE (Lorenzen), with a philosophical unification in the 14th–17th centuries (Nicholson). What took shape under British rule, c. 1750–1947, was the world-religion packaging: one canon, one essence, one census box. How much that packaging changed the thing itself is still contested.

No single person invented it. 'Hindu' is how Iranian speakers pronounced Sanskrit sindhu, 'river', the Indus, and it began as an outsiders' geographical label for the people beyond that river. Indians took it up as a religious self-description mainly between c. 1200 and 1500 CE, contrasting hindū with turk, and the English word 'Hinduism' appears only around 1800. The etymology is consensus; when the self-designation took hold is argued.

It depends which part you date. Hinduism's oldest scripture, the Rigveda, was composed about 3,200 to 3,500 years ago and is still recited, which makes Hinduism the oldest living religion with its earliest text still in use. Its roots in the Indus civilization may reach back 4,000 to 5,000 years, but that link cannot be proven. The form most Hindus practise, with temples and Shiva, Vishnu and the Goddess supreme, took shape 1,400 to 1,700 years ago. The religions of Egypt and Mesopotamia are older, but nobody practises them now.

Yoga as a meditative practice is first described c. 500–300 BCE, when the Katha and Shvetashvatara Upanishads describe breath control and posture. Earlier, in the Rigveda (c. 1500–1200 BCE), 'yoga' means yoking a chariot. Patanjali's Yoga Sutra dates to c. 100 BCE–400 CE, posture-rich hatha yoga is medieval, and today's flowing postural yoga is largely twentieth-century. The claimed 5,000-year-old Indus 'yogi' seal is contested.