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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21.2.19
I have found it best to learn in the local Na Nach synagogue. I tried a Litvack place for a while but that did not work out very well. [Na Nach is agroup of Breslov people that follow Rav Nachman from Uman.]