The probability is a priori unknowable. Until someone can make some falsifiable hypothesis about god that is not made false by the evidence, the question of god is uninteresting - unless you're religious, of course.
Well the question about god may be uninteresting but I think it's the wrong question to ask at this time, given how little we know... I'm Agnostic.
I think a few more interesting questions would be,
- Do the laws of the Universe allow God to exist?
- If the laws of the Universe do allow God to exist, then what can God do that we cannot do and by what process?
- If God existed would God be trans-dimensional? Would God be subject to the laws regarding time?
- If God exists within our Universe, what then will happen as our Universe unravels and eventually ceases to exist?
- Do living things have souls?
- Is the subconscious brain in some manner connected to other living things? Is it further connected to God?
- Is life the birth of a new soul or the continuance of a timeless one? Both? What decides?
Just a few questions...
But it's 4:00 AM here and I'm done for now.
Good debate!