It is simple. There aren't any explanations needed because "god is omnipotent" already covers everything.

But its simplicity involves making MASSIVE assumptions.

And the fact that Occam's razor explicitly says "fewest assumptions" and not "simple" is unchanged.

Quantum mechanics is complicated. Assuming electrons orbit nuclei is simple. But quantum mechanics is backed by countless experiments, so needs less assumptions. If you have to choose between quantum mechanics' description of the atom, or the old, outdated, knowledge of an atom, Occam's Razor would say to choose quantum mechanics.