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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11.7.20
I am wondering during the Black Plague in the Middle Ages, did people need to get tested to see if they had it? How can something be a deadly virus, if one needs to be tested to even see if he has it?