Obviously governments can ban God, because at your behest, our government HAS banned God in schools. As for the inherent properties of "my God," it has no physical existence, therefore, can't "be" anywhere, yet is still everywhere because God IS. Equally as important is the opposite evil energy force which is just as negative as the positive energy force I call God. You may call this "Satan" or "The Devil." It also has no physical properties or existence, and can't "be" anywhere, yet is still everywhere. I know that concept is hard to wrap your little pinhead mind around, because you think of "God" as some physical manifestation of a human man, with superhuman powers.
I get your angle, you wish to conclude that "God is Everywhere" from the perversion of a Biblical explanation that God is omnipresent, and therefore, God was present in Adam Lanza as he mowed down little innocent kids. I reject your conclusion. God was certainly not present in Lanza, but it had nothing to do with government banning God from school. It had much more to do with new-age anti-God hipsters such as yourself, who think it's cool to encourage a culture where we run around denouncing God and bashing those who profess belief in him. The problem with insulating yourself from the energy force known as God, is manifest in the actions of Adam Lanza, who was consumed with the forces of Evil instead. The Christians are correct about "free will" and we all have a choice to open our hearts and minds and accept the positive energy of God, as well as accepting the negative energy forces of Evil. Adam Lanza was filled with Evil, not God.