Dont understand this sentence:they are appealling not to facts about their god?
So telling us that God is eternal and therefore escapes the problem by ducking under the where-did-God-come-from question, they’re appealing not to facts about their god.

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Nor do I. This sentence is poorly written and unclear. It is also incomplete.

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The sentence is not structured or worded very well.   I think it is saying that "they" are not giving any facts to support the position that is God eternal.