The ancient Vedic religion was not the Hinduism we recognize today
While modern Hinduism is often seen as an ancient monolith, its predecessor, the Vedic religion, was a distinct, polytheistic system. It lacked the famous concepts of reincarnation and karma, focusing instead on complex fire sacrifices, ancestor worship, and a cosmic order known as ṛta.
The historical Vedic religion, or Vedism, flourished in the northwestern Indian subcontinent between approximately 150 and 500 BCE. It emerged from a syncretic blend of Indo-Aryan traditions and influences from the Bactria–Margiana culture, as well as remnants of the Indus Valley Civilisation. Unlike the later developments of Hinduism, the early Vedic period was characterized by a focus on the 'Vedas'—sacred texts composed in archaic Sanskrit and preserved through oral transmission for nearly ten centuries.
The religious landscape was defined by elaborate rituals, such as the Soma rituals and the Ashvamedha horse sacrifice. Deities like Indra, Agni, and Varuna were central to these rites, which often involved fire oblations (havir). Interestingly, the core doctrines of reincarnation (saṃsāra) and karma are absent from the earliest layers of the Rigveda; these concepts only began to emerge in later texts like the Upanishads, which shifted focus toward philosophical speculation and the nature of the universe.
The transition from Vedism to Brahmanism occurred during the late Vedic period (c. 1100–500 BCE). This later phase, centered in the Kuru-Panchala realm, placed significant religious and legal importance on the priestly (brāhmaṇa) class. While Brahmanism served as a foundational pillar for modern Hinduism, it was a transformative process that synthesized Vedic traditions with non-Vedic elements, including temple worship, meditation, and the influence of the eastern Ganges plain, eventually creating the complex religious tapestry seen today.
Source: Historical Vedic religion