I'm no big fan of religion, nor do I hold any belief in god, but I came up with an interesting concept that might help reconcile God's power with human freedom.

My idea is that humans are gods of their own minds, and that god is the god of the physical reality they experience. God can make efforts in a human mind just as we can make efforts in the physical world, but neither can fully assert his will in the others' world. Perhaps death, then, is merely the end of the interaction between the god of the mind and the god of the world.

Of course god wouldn't technically be omnipotent, but he'd be pretty damn close.