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I'm not sure what that's even supposed to mean.

Isn't God supposed to be the ultimate origin of all morality? The ultimate source of all goodness of the world?

Yes, God is the source of morality. Without God, morality becomes subjective and therefore a function of who has the most power to enforce their version of morality.

Isn't God a matter of personal faith without any means of objective validation or verification? And therefore God himself and everything that comes from him becomes subjective?

No. God is not simply a matter of personal faith. The existence of God can be deduced from nature itself. Which is how Plato and Aristotle were able to arrive at this fact.

To move beyond his existence to his other attributes, revelation is required. Yet the Bible is one of the most scrutinized and historically verified books we have. So to disregard it would also mean we would have to disregard all other historical writings. Which is absurd.

So I think there is good reason to believe in God and what he has revealed. Not simply my own faith.

You cannot infer and be sure of the existence of the supernatural through the observation of nature. Let alone the existence of a particular God with a particular set of moral rules and commandments. In the end it is all a matter of personal faith, 100% subjective.

You can indeed infer the existence of God simply by observing creation. Aristotle and Plato did it.

Does that tell you everything about God and what he requires? No. Revelation is required for that. But revelation can also be subjected to historical observations and be determined to be trustworthy and therefore reliable.

Is faith also required? Yes, but not at the expense of reason. A certain level of faith is required for almost any body of knowledge we acquire on the authority of others. That doesn't mean that particular body of knowledge is subjective.