Hell and God cant Co-exist.

[Pat Mustard]

God is supposed to be Omnipresent, and Hell is supposed to be a seperation from God.

This makes no sense, they cant co-exist, its one, or neither.
Christians cant sacrifice God's supposed Omnipresense or hell in order to have a somewhat consistent belief.

The supposed paradox is created by not understanding omnipresence. God is present everywhere in the sense that he knows what is happening and sustains his creation in being. That would apply to Hell as well. 

If you then talk about the denizens of Hell being separated from God, that is simply in a personal/relational sense. In that sense, they do not have the experience of the presence of God. 

Imagined problem solved.

No dummy, that's omniscience not omniprescence. And you wonder why I've no respect for your intelligence. Well not knowing the attributes of your favourite fictional character contributes (though it's mostly the masses of bullshit you spout expecting us to take it seriously).