Just as God can't make a square triangle, He can't make a world be outside the very laws of physics of this universe.
That just pushes the question back one step further.
So, let me rephrase:
Why would an omniscient god, when designing the physics of a universe, design those laws of physics in such a way that they inevitably lead to excruciating pain and torment for billions of his creations for eons of time? Why not come up with a less-menacing set of laws?