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Mythras, or Mythra,was an off shoot of Persian Zoroastrianism that centered around the worship of the heroric demi-god Mythras. During the later Roman era of arounnd 100AD - 300AD, the belief system took hold among a minority of the Roman population, ultimately growing to challenge the early Christian church.
Though both were different in the practices of their belief systems, Mythras worship being more secretive and more selective in its converts, both were equally persecuted as they denied the central worship of the Roman emperors.
My question is this:
Fast forward to the reign of Constantine, what if he championed and converted to Cult of Mythras worship instead of Christianity before the battle of the Milvian Bridge? Would Christianity survive future persecution? Would there be 1 Billion+ Mythras worshipers today?
Plausibility Check:
While Christian conversion granted Constantine future legitimacy from the Roman Christian population, many of the Roman elite were secret Mythras worshipers, so the benefit of gained legitimacy could still be achieved.