> You can't, because the beliefs are fundamentally unscientific and self-contradictory. There is no possible world in which the god that actually religious people believe in exists as they believe in him; there are possible worlds in which an entity with approximately the same gross physical properties exists, but such an entity is nothing like the actual religious god.

Why not? I don't think it's likely and I definitely don't build my life under an assumption that this is true.

However I just can't see how this can be ruled out by scientific means. Our world doesn't have to follow any laws at all, this whole thing can be a bad dream of a sleeping giant.