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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15.11.15
A Book on Bava Metzia Book on Shas both were updated. i added a bit. Also I saw one idea was not written very well in the older versions, So I had to go back and explain things.