"The pre-Christian Hungarian pre-Christian religion is probably a version of the belief systems known as shamanism and tengrism, supplemented with specifically Hungarian elements. There are, however, various theories regarding the exact nature and elements of the "Hungarian primordial religion" within and outside academia, so there is currently no unified canon of the Hungarian ancestral religion and Hungarian mythology.
The proto-Hungarians did not make written records, so we can only rely on the records of other peoples, archeological findings, and later reports and folklore. Christianity, starting from the principle of superiority, also ensured that the doctrines and spiritual and material memories of the former pagan faith were destroyed."
Source: https://hu.wikipedia.org/wiki/%C5%90smagyar_vall%C3%A1s