"Prove to me god doesn't exist"

[robvalue]

Ask them to prove that any of the gods they don't believe in, do not exist.

Tell them that you will use the same method to prove theirs doesn't.

Brilliant. If you're going to say anything constructive, this is probably the best method. It probably won't work, at least not right away, but it will at least give them pause for thought. Maybe a seed of rationality will be planted.

I would also say that I have no need or desire to disprove anything that doesn't have evidence in the first place. There are an infinite number of things that could exist or be true, and a finite amount of time in our lives. Evidence is the criteria which shortlists those ideas worth spending time on.

And that I don't care whether God exists or not. Why should I care? I rarely get a sensible answer to this.