The cosmological argument doesn't solve the problem of infinite regress. That's why I asked the question.
The CA just pushes the regress problem down the line by invoking God without explaining what causes God. If God is uncaused, then why can't the universe be uncaused? If God is super mysterious and inscrutable, then you really have no explanation at all.
The idea of causing in CA arguments is puzzling to me. We know that throwing a ball off a ledge will cause the ball to fall to the ground, but what causes a universe? That's what science is trying to figure out! So, I don't think we have a very good notion of cause as it applies to the universe itself.
The whole point of the Aquinas CA is to solve the issue of the infinite regress via. the uncaused cause stuff. That's the whole point of God as uncaused cause, he has to be there by necessity. We have the best notion of cause as it applies to the universe itself, "In the beginning, God created the heavens and the Earth." Science does say the method of creation, but science has no competing notion of what the cause is.
My question to you Larry is, how can you scientifically look for the cause of the universe from inside the universe? Seems to me you gotta go outside the universe to get that kind of a vantage point, which is impossible from a human perspective.