The Most Obvious Thing
Atheists like to switch up their standards of evidence in mid conversation.
So, I have a solution.
Just state the most obvious thing, and I will prove that God exists from it.
That is all.
Q: Why didn't you address (post x) that I made in response to you nine minutes ago???
A: Because I have (a) a job, (b) familial obligations, (c) social obligations, and (d) probably a lot of other atheists responded to the same post you did, since I am practically the token Christian on this site now. Be patient, please.