do religious people really believe?

[Neo-Scholastic]

If a Supreme Being never had a Creator, then that same logic can be applied to an Eternal Universe that never had a Creator, but came into being. If one wants to argue "But Who made it come into being", one can apply that same question to a Supreme Being. Speaking of a Creator is only adding another layer to the story, and it's "turtles all the way down." You can keep adding Creators, or just drop that entire thought and it works equally well.

You do not understand the complexities of ontological arguments. There are serious challenges to them, but yours is not one of them. The problem has never been infinite regress. The difference is between non-contingent things that must be of necessity and non-contingent things that things that are not required even though they exist. This issue is currently being debated on the thread about Deism.

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I think you've been here long enough to know we're going to need more than a flat assertion before we go along with that.

True, but I save the more detailed and subtle arguments for people who can understand them, like Apo, Gen, FTR, and Whateverest. You just don't rise to their caliber.