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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18.9.22
Rav Nachman did not say to go to his grave on Rosh Hashanah. He did however say so for the tikun klali, but not Rosh Hashanah. For Rosh Hashanah he said to come to him. He never said anything about his grave in connection with Rosh Hashanah.