Atheists, What Would It Take for You to Believe in God/Christianity?

Just as a disclaimer, I’m not trying to argue with anyone in the comments, I just genuinely want to know what evidence or experience(s) atheists or agnostics in this subreddit think they would need to have in order to believe that God exists and/or that Christianity is true.

Is there a threshold of evidence that would lead you to eventually believe (regardless of if you think that evidence exists now)? If not, why?