I am sorry to hear you were deceived, cheated on, etc. It really sucks when it happens and still hurts long afterwards. I still hate my ex and the last two times I saw her, I did not speak to her purposefully (told her that I wouldn't the last time I spoke to her and kept my word). She just happened to show up mysteriously at my work and I ignored her both times (comes naturally to an aspie). Very immature of me I know, but I avoided another potential smashing at her hands. I doubt it would hurt you to do about the same.
Forget this guy, move on and hopefully you will find someone else actually worth your while in the future. Him being Christian probably has nothing to do with him cheating, he could be any religion or none at all and still do that. I can't understand why people who can't stop themselves from cheating even get into mutually exclusive relationships, once a cheat always a cheat in my opinion. All they do is hurt people. He does sound like he needs a good beating lol.