Is it possible to use math to come to a conclusion, one way or the other, about God’s existence?
No, but that won’t stop people from trying. The video below points out how people use numbers to justify God’s existence — without taking a stance on it.
In short, to make this work, you have to make up a lot of numbers and estimate probabilities you just don’t have reliable information about. It’s all speculation. Exactly what you’d expect with faith.