When you get down to a very small level, sometimes refered to as the quantum level, the universe becomes a strange place, at least to our human sized preconcieved notions of How Things Work. Radioactive decay is an example of this sort of weirdness: we can never tell when a particular atom is going to decay, but if we have a big pile of them, we can say how long it will take for half of them to have undergone decay with pretty good certainty.
Let's assume for a moment that the Christians are right: God exists and He's a vicious tyrant bent on forcing His creations to live in eternal pain, but who has nonetheless managed to convince a handful of those creations that He is loving and kind and just, mainly so that they will go out and visit unspeakable horrors on His other creations.
It would not be unthinkable that a creature that clever would be able to set up the universe in such a way that His own presence would be undetectable. How might He go about doing that? Why, with quantum mechanics, of course! You see, He would make everything run according to some probabilistic law: the outcome of any particular event would be completely unpredictable, but the pattern of those outcomes would become quite apparent given a large enough sample set. In this way, He could intervene by changing the outcome of a single event without violating His own laws.
The result of this would be a completely undetectable God who was able to alter the universe in large and detectable ways. In fact, given the current body of evidence, this is about the only way God could exist. So there you have it, Christians: your God is the ultimate jerk who uses only your belief in Him to determine where you spend all enternity while covering His tracks and making it completely impossible to detect Him until Judgement Day. And to me, that sounds a lot like "He beats me because He loves me."