>I have never experienced nothing
No, because you didn't exist. You won't exist when you die, it will be just like before your birth. Nothing.
>why shouldn't a person kill himself?
If not having Mr Sky Daddy over there to put his invisible hand on your shoulder when your life sucks is going to make you kill yourself, then you must have a pretty shit life. Humans don't kill themselves because they usually enjoy life enough and they have an inclination to be revolted by suicide.
>drive for reproduction
It did answer your question. Love is an incentive to reproduce and raise children.

Christians get divorced too matey. Most people in Western countries outside of America are atheist, and you lot are actually retarded.
Most theists are child rapists and murderers.