Christian leaders compromised with Mithraism.  Mithraism similar in appearance and ritual to early Christianity.  Mithraism was competitor of Paul’s Christianity.  Paul’s atonement doctrine derived from.  Roman Mithraic temple became Christian church. 
Arose in Iran.  Encouraged militarism; tolerant of other religions.  Greatly improved by Zoroaster’s teachings.  Iranian priests resurrected Mithraism to combat Zoroastrianism.  Jesus sought out worthwhile Mithraism leaders.  Orgiastic celebrations.  Roman legions spread Mithraism over Empire.  School at Urmia reopened as temple of.  Sol Invictus was sun-god of.  Sun worship gave rise to Mithraism in Iran.  Supplanted Phrygian and Egyptian mysteries.