Belief in God is rational.
Everything has a cause. So unless there is a first cause, then you would have an infinite regress. And then nothing could exist. Therefore there must be a first cause. Therefore God, the first cause, exists. QED.
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10.6.20
I noticed a few years ago that the author of the Mishna [Yehuda the Prince] that he never said, "No".
[That I saw in the Yerushalmi, but I forgot the place.]