God

I've been thinking about this recently. Our claim, believers, is a claim of fact: There is a God. And some of us, for the sake of example you and I, also claim evidence for this.
Does this make the existence of God a fact?
There will always be those who disagree, there are physicists who disagree about the Big Bang (although more so in the past), there are evolutionary biologists who disagree about evolution, and so on (these are just examples to convey the message that disagreement always exists).
The definition of proof is “something that is known or proven to be true.” We have evidence, and we claim that it proves the existence of God, meaning that his existence is proven and thus his existence is a fact?