The detective is just now saying what you said: I AM GOD; I WILL DO WHATEVER YOU DON'T THINK I WILL; I AM IN CONTROL.
The more stuff that comes out about the psychological profile of the sniper, the less I think it is the work of a terrorist. This "I am God" stuff is more like the Son of Sam than Bin Laden. Muslims try to "please" God (by killing infidels), not "be" God.
Ultimately, this might be one sick creep with alot of time on his hands.