If God is real, how come he has never revealed himself to the world and made clear the true events as depicted in the Bible.?

The short answer; hell needs filling.

The obvious reason is because there is no god. The god people believe in seems to me to be passive aggressive. Think of a girlfriend who gets mad at you, but when you ask why says, "If you don't know, I'm not going to tell you!" I would expect more of a god, but the believers have extremely low expectations for their god.

Because God is spirit. For him to reveal himself he would have to materialize into something that we can see. The Bible say no one can see God and live, so he sent his begotten son instead who is his image and who had to be born as a human but with all the innate qualities of his Father .

The bible says that surely god is a god who hides himself.

Because god doesn't exist. There's absolutely no proof that god does exist.

And before anyone says "prove god doesn't exist", you can't actually prove it, because there's nothing there to prove.

If someone believes in something that is invisible, and they wish to preach about it to atheists, we need to actually see it.

Seeing is believing!

He reveals himself. Lots of people have met him. I've talked with him. He showed me the Bible is true.

According to the Bible, he did just that - and on more than one occasion.

Gods are figments of the human imagination.

Because he isn't real.