Go to Hell
That might as well be what some churches put on their signs in front of the church. Or, how about, “You’re right, you don’t belong in here.” Or, if we really want to be honest, “We would say that we want you to come join us, but we don’t. You’re too _________ (fill in the blank with whatever we might find wrong with you) for us. We just want to feel good about ourselves becasue we have a sign for the lost like you.” But I guess that one really is too long.