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M*W: The early church fathers were Romans. Christianity wasn't created until the end of the 3rd century, long after Constantine had his say. In fact, Jesus wasn't even considered divine until that point in time. Then the trinity was made up, as was the crucifixion and resurrection. In fact, there is a school of thought today that the Romans invented the entirety of christianity to control the masses and books are being published on this theory. See:
Caesar's Messiah: The Roman Conspiracy to Invent Jesus, by Joseph Atwill, 2005.
Jesus Was Caesar: On the Julian Origin of Christianity -- An Investigative Report, by Francesco Carotta, 1999.
Josephus the Satirist? A Clue to the Original Form of the Testimonium Flavianum, by Albert A. Bell, 1976.
I don´t find any of that feasible, it is a known fact that by the II Century AC, Mithraism was the biggest religion movement across the Roman empire, Christianity was the second and growing. But the Roman Empire was so wide, that pagans, egyptians, greeks, phylosophers and astronomers had an important role in society as well. When the Romans created this Catholic Religion, and made it the official religion, they could not have done it with the sympathy of all the beliefs across the empire.
So they got pieces of every belief and incorporated them in this new movement. The adoption of imagery or icons or festivals was obvious (such as the adoption by Christendom of winter solstice or Saturnalia festivals (Mithraism) as Christmas) ammong many other apparent atrological similarities.
The thing is, why would the Romans made Jesus up, around the 3º Century AC, if Mithraism was the most popular religion ammong Romans? They already had Mythra, why would they make Jesus up?
"The Roman army first encountered the cult of Mithras in Persia (modern Iran) during the reign of the emperor Nero although its origins in India have been traced back to 1400 BC. One of the many mystery cults that the Romans introduced from the east, Mithraism first appealed to slaves and freedmen but with Mithras's title Invictus, the cult's emphasis on truth, honour and courage, and its demand for discipline soon led to Mithras becoming a god of soldiers and traders. "
http://museums.ncl.ac.uk/archive/mithras/text.htm
So Romans were warlords by excellence, and believed in Mithras, god of soldiers and trader.
But why would they make Jesus up? Jesus spread the word of love and peace, the Romans weren´t exactly known for those virtues were they?