Mithraism, in particular, is arguably very tightly linked to Christianity in early Christian history. By one theory, before Constantine's reforms that merged t

Mithraism, in particular, is arguably very tightly linked to Christianity in early Christian history. By one theory, before Constantine's reforms that merged the two religions, Christianity was popular among the plebians while Mithraism was very popular among the patrician class, and the modern form of Christianity is arguably more similar to the old religion of the patricians.