Terry: "If God could do just one thing that would make it clear He actually exists in order to convince the world today---what would it be?"
How would you answer?
I'm tough and gristly with a very high pain tolerance. I don't need to prove I am tough, I just am. Some find that out too late for them, on some occasions, because I look like a big teddy bear. Those who seek to find this out tend to find this out rather abruptly and completely.
I'm a hopeful romantic. I don't need to prove I am a romantic, I just am. Some find that out, on occasion, and they are surprised by it because they had correctly assumed I was tough. It seems incongruous to them that I should be both, but I am.
I love reading and learning. I don't need to prove I love reading and learning, I just do.
This goes on and on, but there is a point ... you have no proof I exist. None whatsoever. And yet, I do.
If I were God I wouldn't bother trying to convince you of anything. If God exists no amount of disbelief from any number of people will ever eliminate His existence, why would He feel a need to prove it?
Especially if people have misinterpreted Him as being interested in which human is having sex with which other human (for instance), He might have quite a few good reasons to let humanity percolate along for a while.
—AuldSoul