The first major spread of Christianity was when Constantine legalized it around 300 A.D., and it spread throughout the Roman empire.
Notice;
http://www.waupun.k12.wi.us/Policy/o...istianity.html.
This is one of the ways that Christianity got so exposed to paganism, many of its new converts were already heavily indoctrinated with paganism, and they brought these ways with them. The mixture of Christianity and paganism, filtered with philosophy, produced the origins of many Christian doctrines and celebrations today. It was a natural thing, slowly mixed into the Christian bloodstream year after year; the powerful forces that be, determined the future of Christianity way back in this incredible history.
There was, and still is, great deception taking place. In order to get a true believer to accept that paganism, you had to deceive them, make them comfortable with the changes, and make them " Believe the deceptions." Christianity is not stupid, but they all are human. Any human can be deceived; but they must not " See the deception." If they see it, they won't go for it.
A deceived person does not know they are deceived.
In order for satan to deceive a whole world, Rev. 12:9, he needed a world wide power of influence. Nearly one third of the people of the world are Christians. Many people listen to Christians, they have great influence. satan knew Christianity was spreading, so he " Helped Christianity spread", he is the god of this world; having great influence. satan is another reason Christianity has spread so much. The Devil knew, because satan is not stupid, if he could get into Christianity, he would then have inside access to a church of God, and thus have a hidden influence on the whole world, masked inside of a religion.
So satan persuades the Christian leadership with a zealous chase; like a hunter chasing its prey. But does so in a way that the leaders " Think its God." They have to think its God, or satan could not deceive them.
So satan spends a lot of time HELPING the ministry, giving them certain knowledge, blessing them with money, goods, and power. Masking himself as God. You can't deceive a whole nation of believers, by constantly hurting them. The devil is not stupid and ignorant, he is VERY wise and intelligent. You set a trap with something worth getting at, you entice the persons lust , and you give them things that they enjoy and need. And you do so, NEVER letting them realize that you are not God, you MUST lead them like God would lead them.
This is an original reason how Christianity spread. One of many reasons we will look at.