God isn't practically needed as a starting point. If we want to understand something, it's generally about the world we live in, so we have to assume that our minds can represent something true about the world through our senses. If our senses are completely false all the time then we have no starting point.
Maybe the world doesn't exist somehow, or maybe it began 5 seconds ago, but if we want to learn anything about the world we appear to live in, we have to assume for now that our senses have some truth to them.
I will grant that some kind of reality of our senses is a reasonable basic belief. But I also think that some kind of basic belief about first cause can be a basic belief. I don't think you could claim a fully developed theology about the nature of God is basic, but whether or not this cause is natural or supernatural seems valid as a basic belief.
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