If there is a creator, so what?

[Ignorant]

So,

A thing has limited participation in God. That limited participation subsists as something distinct from God in which it participates? [1]

So are you saying that good things have limited participation within God, and they are themselves distinct from God, despite participating within him? [2]

What is God's subsistent-being? [3]

How could I come to know God in order to care about God? [4] (As far as I am concerned, I'd care about God if I knew of God because I'd care about knowing the truth of God... but "knowing the truth of God" is just a longer way of saying "knowing God", really. Caring about the truth of something and caring about something is the same thing, as far as I am concerned. To care that something is true is just to care that something is. "It is true that I am happy" is just a long way to say "I am happy". "True" and "false" have no meanings by themselves).

1) Yes.

2) Yes.

3) Great question. Closest things we have are: Being, Goodness, Truth, Act, etc.

4) Like I said before and Rhythm as pointed out, I only know of two ways: a) Through reason - knowledge of god as mediated through the things participating in god; b) Through "Revelation" - knowledge of god directly from god itself.