How are you here? Ask your self that. Their had to be some kind of force, or person to make everything. And that was God. I mean it's your choice if you want to belive or not, I don't like to push my belifs onto people. Unlike some people. :)
"Why are some people obsessed with God?" - Easy, they were either indoctrinated to believe so, OR they were brought up predisposed to look outside them selves to FEEL complete. Those who do not know how To be complete on their own, will look for something to achieve this . . . Be it Drugs, Alcohol or God/Gods.
"How do we know he is even real?" - We do NOT. All we have in the way of even knowing of the CONCEPT of God/Gods is iron age writings of man. This is the only REAL CLAIM . . "There is a God/Gods."
Un-validate so null and void.