Assuming a creator-god exists: what is the one question you would ask it in complete sincerity? The one thing you want an answer to?

Why so many dead children? Why droughts in third world countries? Why third world countries?

multitude of galaxies? why because NASA said so? They're a bunch of liars. It's only earth that has life and when the aliens come to earth - you may be deceived because they are demons in disguise.

I don't need an answer. I just hope I hear him say "well done, good and faithful servant"

It doesn't matter how small we are, God knows us each and knows our thoughts and hearts. He made us and wants us all to be saved. This world is the most hell a believer will have to endure. But for the unbeliever, it's the most heaven he will ever have.

Jesus is my Lord and Savior.

I would say that hopelessness is the very word that describes atheism. Never to see loved ones again. And for what gain? Atheists lose the love of God and the people they love in order to live their lives without the authority of anyone above them. They get to live outside the bondage of love.

I have met God. When you are in God's Presence you don't have any questions because He is enough.

What is the meaning of life?

i would ask :

when i butter a piece of bread - why does it always fall on the floor butter side down

Why the game of hide and seek?

He is real so no need for assuming.

I would ask of Him nothing as He is our One Perfect Being.

I wouldn't waste my breath on the incompetent loser.

To your comment: NO!!!

Just this one, all encompassing but fundamental question: "why?"