SOME RESEARCH
http://www.gotquestions.org/origin-Catholic-church.html
I tried to bring some of it up but it won't copy for some reason. It isn't very long.
http://www.gadling.com/2010/09/21/th...ed-to-christi/
In the year 300 AD, Christianity was a minority religion in the Roman Empire, practiced by perhaps ten percent of the population. In good years it was discriminated against; in bad years it was persecuted. By 400 AD, a century later, it had become the official religion practiced by pretty much everyone. Evidence of this remarkable transformation can still be seen in Rome's monuments.
Teachers in Sunday schools like to tell a story about how it happened.
In the year 312 there ruled a Roman Emperor named Maxentius who had taken power illegally. He hated Christians and persecuted them. The proper heir to the throne, Constantine, marched on Rome to save the Empire. Before the two forces met in battle, Constantine saw a vision of a cross in the sky and the words "Conquer under this". Constantine and his army converted to Christianity and painted the cross on their shields. The next day they defeated the pagans and brought Christianity to Rome.
This story is almost entirely wrong, yet it has resonated down the centuries through books, paintings, and films to become part of the Christian legend.
Constantine gave one great boon to the Christians--he legalized their religion. From then on it rapidly gained more followers and began edging out the pagan cults. Soon it was the pagans being persecuted. Rioting monks trashed temples and killed pagan philosophers like Hypatia. In 382 the Altar of Victory was removed from its centuries-old home in the Senate. In 391 paganism was outlawed and temples shut all over the Empire. The old cults hung on for a few generations in rural areas, but Christianity was now the dominant power
Mithras was Christianity's main rival. As a mystery religion with its deepest teachings revealed only to the initiated, we don't know much about its inner workings. What we do know shows many similarities between Mithraism and Christianity, such as the belief that Mithras was born on December 25 to a virgin, and died and was resurrected in order to save mankind
The Pagan, virgin birth and dying son, was started at Babel.
The transition from pagan to Christian isn't always as obvious as in San Clemente. Sometimes you can see it in the art, such as the image above, a 4th century mosaic from Santa Pudenziana. Here Christ sits enthroned in a pose identical to many statues of the pagan god Jupiter. Saints Peter and Paul sit to either side dressed as Roman senators. The early Christians saw nothing wrong with this. They wanted to win the hearts and minds of the people, and a bit of reworked pagan symbolism was a good way to do that.
At times the Christians reused old buildings or parts of old buildings. San Maria Maggiore, a third century basilica, was originally a secular building before being converted into a house of worship
TO BE CONTINUED