Because it is better to "serve" God without being his slave. It benefits you and him, it's a better relation.
Making you believe, he could, but he wants you to chose him freely.Why? Who does that benefit?
Wow. Just simply wow.
Okay, you do in fact believe in a sadistic cruel dictator god.
Okay then, if your god does in fact exist, and when I die and stand before your god, I will gladly unzip my pants, pull out my cock, and piss directly onto your god. I welcome being the slave of your god as that is the only moral choice.
I will not submit to a dictator just to serve while others are forced to be slaves.
You can take your god and shove it right up your ass where it came from.
EDIT: One other thing, if you are serving your god in heaven, how exactly are you not already a slave? Sounds like you are screwed no matter what, it's just that you are happy about being screwed.