Mithraism was a greatly older religion than Christianity; but its genesis was similar.
"Pagan & Christian Creeds" by Edward Carpenter
Christianity bears alarming resemblances to Mithraism.
"Visionaries" by James Huneker
In the reign of Pompey, Mithraism, a cult borrowed from Persia, was spread throughout the empire.
"Reincarnation" by Th. Pascal
It was manifestly prior both to Christianity and to Mithraism.
"The Oriental Religions in Roman Paganism" by Franz Cumont
A more important fact was that Mithraism was a religion of redemption.
"Introduction to the History of Religions" by Crawford Howell Toy
Was this so in Mithraism or in the cult of Isis?
"Landmarks in the History of Early Christianity" by Kirsopp Lake
But these more primitive rites were being displaced by a more developed and ethical form called Mithraism.
"The Next Step in Religion" by Roy Wood Sellars
Prominent among these was Mithraism.
"A Short History of the World" by H. G. Wells
In the centuries immediately following Jesus' death, European civilization was fairly nonexistent and Christianity was just one of a number of religions vying for followers with the likes of Mithraism, Baalism, and Gnosticism.