Let’s consider further the probabilities involved by considering the case for the existence of unicorns. We would assume that unicorns are physical creatures, composed of atoms. There is a no doubt large number of atom configurations that would produce a creature we would recognize as a unicorn (we must think like statistical physicists here). It’s completely plausible that, possibly through convergent evolution, a unicorn might exist somewhere in the universe, no matter how exactly we define a unicorn. A universe where a unicorn exists is a finite subset of all the possible states a universe might be in, also a finite group. Ergo, the probability of a unicorn existing is at least finite as far as we know.
If, on the other hand, we accept the existence of supernatural creatures, universe is no longer composed of a finite number of possible states. Basically it means that we accept everything is possible. But since there is still a finite number of states a universe must be in for it to have a creature we would even remotely recognize as the God, the a priori probability of God’s existence is 0.
This means that God, gods, or any other supernatural phenomena for which we have no evidence for, almost certainly does not exist. I for one am not impressed with the evidence presented, therefore I say God almost certainly does not exist.