God is stated to be the only eternal being (Revelation 22:13) from which everything manifested from (John 1:3). Because, by definition, he created time; thus, He isn't limited by the time dimension He created, making logical that He doesn't require a cause.
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But he does require evidence to assume he exists.
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My point when asking that question wasn't wether or not it's possible, it was an attempt to prod him to say that he always was so I could say that it wouldn't be so crazy for him to think that the matter that could cause a big bang always existed.