If you're just trying to demonstrate that something is deeply wrong with beliefs in God, you don't need to go any farther.

How many days are in a year? Well, every month has four weeks, and a week has eight days. So...

HANG ON! We don't need to go any farther! We've already uncovered two critical flaws, so whatever the answer is, even if it is correct, this argument doesn't show it.

If God is the God of the Old Testament, and there are problems with it, this suffices to show that there are problems with the conception of God.