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
Invading the Sacred lead to a longterm process impacting the study of Hinduism in the USA," and notes that the real debate should not be a political debate, but a debate on the one-sidedness of text-based Indological studies. Invading the Sacred Invading The Sacred: An Analysis Of Hinduism Studies In America is a critical work published in 2007 by Rupa & Co. which argues that there are factual inaccuracies in Hindu studies. The editors of the book are Krishnan Ramaswamy, Antonio de Nicolas, and Aditi Banerjee. The book has contributions from Arvind Sharma of McGill University, S. N. Balagangadhara of Ghent University, psychoanalyst