God is the definition of good
Well, that's how some Christians try to define good. It's not universally seen that way.
and in order to be good without God you'd have to have good coming from outside of itself, a logical impossibility.
That doesn't really follow. If God had created human beings with at least some power for goodness (Man being created in God's image, after all), then goodness could arise from human beings simply because they are human beings. The ultimate explanation for that goodness might be God (from within a Christian worldview), but human beings would still have a human power for goodness.
God is the source of good and therefore everything that God proclaims and does is good by definition.
That's convenient. Murder, rape, genocide...if God does it, it's good by definition!
I don't think that you
really mean that it's good by
definition. What you mean is that God is like a spigot out of which only goodness flows. That doesn't make what comes out good by definition, but good by one's understanding of the situation.
Nothing morally good can come from any source outside of God and therefore nothing can be morally good unless God defines it as such.
More defining? Murder, rape, and theft are good if God defines them that way?
Human beings do not define what moral goodness is; God does.
I understand that you believe this. You just seem to be arguing that you're right because you've chosen the premises in which you're right.
God knows the true difference between good and evil because God is, by definition, the most intelligent being that there is.
More definitions...coming from theologians...who are human beings.
Everyone else is of less intelligence, so we should trust what God says about good and evil above everyone else.
That doesn't follow. Intelligence does not guarantee correctness, and it doesn't mean that everyone else should stop thinking and questioning and having integrity.
eudaimonia,
Mark