The Probability of a God Using that same reasoning there is a fifty-fifty chance that there is a flying pink unicorn next to me chanting in Aramaic, because it either exists, or it doesn't. — Javants
You are not paying attention. Probability requires a chance mechanism. You flip a coin; that coin has a chance to land on heads or tails, but once it lands there is no more chance involved, as it is either heads or tails. That result will not change no matter how many times you look at the coin. The only way for chance to come back into play is to flip the coin again.
This is the basic concept of probability you learn when studying statistics.
This is the academic definition of probability: Probability is the proportion of possible out comes under the repeat exercise of a random event.
Your claim here:
"These probabilities are made on the basis of how many times the outcome of a God existing is reached when we systematically analyse all the possibilities (as far as we know) of how we come to exist and whether or not other beings exist."
Is not a random event.
A random event is either random assignment or random sampling, and it requires all units of a population have an equal probability of being selected (that is how you get your proportion). The randomization is important for many reasons, but mostly to control confounding variables (or what you are calling "possibilities").
It is more than clear that you don't really know what probability is and you know even less about how to apply it. You are using a layman's grasp of probability and trying to use it for things it cannot tell us.
God is either there or is not there. If God exist then there is not a 33% chance that God exist. If God does not exist there is not a 33% chance that God exist. That makes no sense at all. Tell me do you have a 33% chance to exist? Things that exist don't have a chance to exist, only things that currently do not exist can have a chance to exist.
The existence of God is not dependent on the chance values you made up, God's existence is independent of those values.