Robby Hall discusses how much evidence is needed to believe something. He gives the example of a circumstantial court case to show that you don’t have to be absolutely certain to know that something is true. In fact, certain, or indubitable knowledge is almost always impossible. You can always cast doubt on something, that doesn’t mean it is false.
Do I have to be absolutely certain before I can say Christianity is true?
Haden Clark 
I use backwards proof, meaning that by proving Cain is real, alive and well God must be real too.
Since only God and Nature have the ability to place a natural birthmark on someone which matches various scriptures and stories from multiple religions after all.
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When you consider pragmatic considerations a rational person may believe something even though they do not think the evidence suggests it is more likely than not true.
I explain practical versus theoretical rationality here:
https://trueandreasonable.co/2014/06/30/practical-versus-theoretical-rationality/
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