Question About Predestination

[BrotherEastman]

Okay, I know there are some smart people out there so I have to ask the question.....seriously, because I don't know.

I do know this however, God is omnipresent, God is omnipotent, and God is omniscient. Because I know these things I am confused about "predestination".

Does God "know" who is going to go to heaven and who is going to go to hell? If God already "knows", then what difference does it make if we serve Him or not? Is it because we don't "know"?

Somebody give me a good thought out answer and not just some "pat" answer.