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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23.8.20
That would be the time to celebrate Rosh Hashanah
September 17 at 2:00 PM is the new moon. That would be the time to celebrate Rosh Hashanah according to the Gemara in Sanhedrin page 10 that the new moon does not depend on the court sanctifying it.