[jimt]

We appear to have reached the bottom line in this discussion. Sophistry aside, it's "God said it, I believe it, and that settles it".

There is no logical reply to that position.

[Aquinasfan]

There is no logical reply to that position.

That's true with appeals to revelation alone, although it is possible to determine whether divine revelation contradicts reason. Nevertheless, arguments based on reason alone, proceeding from First Principles, such as "the good is to be done and evil avoided," are knowable by all with at least moral certainty.

You might enjoy Aristotle's Nicomachean Ethics. He didn't appeal to divine revelation at all.