Yeah I know tl;dr but I have ~thoughts~
It's hard not to answer this as "God would be a being that none of us would comprehend, with no name, no gender, and no appearance we could pin down." Admittedly my views on God get more skewed the more I write. In my writing, I have full control; God can be what I want out of a possible higher power. It's hard not to have those feelings leak into my real beliefs. (Which are practically non-existent; as much as I'd like gods and an afterlife, I highly doubt there's anything after life.)
If God were human? I'd imagine a pretty androgynous appearance. I mean, does God really have a gender? And if God does, why does God always have to be a he? :( That said, God would have a unisex name, too. Jordan was the first name to pop up in my head, so I'm going to go with that for the time being, although really, any unisex name would do. As for age, I'd say younger, in the 20s to 30s, with an average build. God is typically depicted as old, but idk, I'd imagine something a bit more youthful would be more fitting if God were living among humans. Hair/eye/skin color doesn't really matter; maybe
Ambiouglsy Brown to keep up with the mystery. (Beware of TVTropes link.)
Overall, I guess I'd say I imagine something just... average. Nothing too out of the ordinary. Nothing that would make everyone think this person is God.
I'd probably jump at the chance to meet with God. Like I said, I'd like there to be at least one God out there. I'd be really timid about talking with God though. I'd only use God's name if God gave me permission. Even then I'd probably feel really awkward about it. Why would I be on first-name terms with God? Is it something God does often? If not, why would I have the right over others?
If I only had one question, I suppose I'd ask... why create Earth and humanity as it is? I wonder why, if the universe was created by a God, it was made as it is. Many would consider it imperfect. They want a future where everyone is accepted, where it's all peaceful and happy and there are no problems. However, while humanity has overcome many of its obstacles over the years, I honestly don't know if there will be a truly peaceful, accepting time in our history.
I'd wish the whole time I could have a full debate about God's role in the creation and continued existence of the universe, and see if I can learn anything about the afterlife. There's so much I'd want to know, but I doubt I'd be given the chance. :(