Quote Originally Posted by AntiochusIII
Really? Constantine, and most of his heirs, supported Christianity. And Constantine was one of the strongest late Roman emperors around; his myth of benevolence is a shallow propaganda from the church trying to make a bloody soldier into a saint simply because he supported it.
Eventually, Rome supported it, but it didn't really spread until Rome had fallen and the church sent missionaries out to convert the heathens. Assuming that Rome did not continue to annex territory, as it was no state to do so before it...never fell... there would have been far more peoples who had never converted to Christianity.

Of course, there's nothing to say the Rome wouldn't have converted to Islam like it had converted Christianity, or even grown to reject Christianity to return to paganism. It's all conjecture anyway.