Hell. Even a heathen knows not to diddle kids, and the heathen isn't professing anything! Fat lot of good that profession does for the kid that got diddled by the Christian pedo! It'll probably turn the kid into an atheist. So in terms of soul winning, that's a big L.One of them at least professes to follow. They have knowledge of right and wrong.
I don't think there's a moral advantage to being a Christian pedophile over a Marxist pedophile except at least the Christian pedo isn't Marxist, if that's much of a plus. The kid gets violated either way.