Q&A:  The God of which religion has the highest probability of existing?

The probability of God’s existence is in the human mind/calculation.

Given that, the probability you are seeking is 1 (ONE) for every believer (in God) and 0 (ZERO) for every non-believer. The god in this context refers to the God of the particular religion to which one belongs. 

God and You alone may know what one will/can do with this non-Gaussian distribution of probabilities.