for people whom believe "God is omnipotent", you're throwing the words "God can't" and "God cannot" around too much.
that's the opposite of omnipotent. it's funny how people whom believe the most, know the least :))
om·nip·o·tent
adjective
adjective: omnipotent
(of a deity) having unlimited power; able to do anything.
Do let people know what you really mean