I like to think that someday, maybe when they die and confront their God, they will be in for a biiiiiig surprise.

I'm with you on that one.

IMO, one of the big problems with both Christianity and Islam is the idea that "there is only one true God - and it's mine!" - and that this can be used to justify all sorts of horrible things you do to people who don't folow that one and only true God. Judaism (the other major monotheistic religion) doesn't seem to have quite so bad a history in this regard (though some factions of Judaism seem quite determined to catch up to its younger cousins).