No one is calling God an idol. The reference is to the “self”. When you put yourself in God’s great seat of judgment, and start imagining “What Would God Do”, that is idolotry.
I believe such a grave charge requires some supporting documentation. Answering the question out of the bible is not an example of any kind of idolatry, even if the answer is of limited direct use. (Jesus never married, as an obvious example.)