well if you say that everything contingent requires an explanation, and God is the only necessary entity, then you've set it up so that every explanation eventually leads back to God, and you really don't know anything about God except that "it explains everything!" it might be a sound system, but it doesn't tell you anything. then you can use the bible and start giving God some of the contingent qualities it gives to get a sense of him, but that pretty much amounts to "explaining God" in terms of lower, contingent truths. seems like one would get stuck on this sort of logic.
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