OK, I'll give this author an "A" for effort. But if you Catholics are going to let this author get away with referencing God as "itself," then shame on you.
God is Personal. He's not some impersonal entity. The Bible NEVER describes God as an "It."
So what RC lurkers & FReepers are actually going to take the time and e-mail Mr. Baruzzini that if He doesn't personally know a personal God, what's he doing writing about Him? (or something to that effect)
If somebody's ignorant about Someone as important as God, don't export the ignorance.
The reference is to self-knowledge, not to God.
It is an awkward construction, to be sure; but the entire doctrine of the Trinity is a difficult one to understand and explain. I would cut the author some slack.
"It" in the sentence you complain of modifies "self-knowledge", not God the Father (or God the Son for that matter).
Sometimes in quick-draw nitpicking you shoot yourself in the nit.
Why not? Catholics have exported "trinity" to you. You bought it hook, line, & sinker. Now you're going to tweak it for them? laughable.