@sovietchild
Many Christians believe God to be omnipotent, omniscient, and omnipresent.
According to those beliefs about God -- the being omnipresent part --there
is no place God is not, at all times.
That's what omnipresent means. It is not a matter of God being able to enter a realm God does not already exist in. God is already there.
If one believes God is omnipresent and also believes God is not in a location, one does not believe God is everywhere at once. That is a limitation of God.
If one is to believe God is omnipresent, and then says that God is not here, one must add some kind of belief that has the power to effect some kind of separation from that which is not separated.
(People often do that to convince themselves and others they are better in God's eyes than the people they are criticizing. They create a belief that says "that group" is separated from that which cannot be separated.)
Many Christians believe in the concept of a type of sin that caused an actual separation from God, and that Jesus came to redeem that. This is an area where there is much disagreement. Some believe that the "sin" was simply an error in a "belief of separation from God," when none could actually exist. There is much disagreement among various Christian groups as to the nature and role of Jesus, but not so much disagreement in God's ability.