Historical Vedic religion from c. 500 BCE, declined in India over the 5th to 12th centuries in favor of Puranic Hinduism and Islam. Historical Vedic religion The historical Vedic religion (also known as Vedism, Brahmanism, Vedic Brahmanism, and ancient Hinduism) refers to the religious ideas and practices among Indo-Aryan-speaking peoples of ancient India after about 1500 BCE. These ideas and practices are found in the Vedic texts, and they were one of the major influences that shaped contemporary Hinduism. According to the "Encyclopædia Britannica", in the Hindu tradition and particularly in India, the Vedic religion is considered to be a part of Hinduism.
Ancient Iranian religion was strongly connected. Beginning in the early 10th-century BC, the ancient Iranian religion was gradually displaced by Zoroastrianism, which contains many essential aspects of its predecessor. The sources on ancient Iranian religion, though limited, consist of textual and material sources. The textual sources are both Iranian and non-Iranian. An important Iranian source is the Avesta, which are Zoroastrian sacred scriptures made in the Avestan. This is considered the principal source of knowledge on ancient Iranian religions. It is a collection of several texts that seems to have been over a large span of time by a variety of authors. These