The idea is that Humans are diffrent from other creatures God made in the sence we have a physical body and a spirit. Unlike "demons" per se, who would be strictly spirits or animals (other then humans) who are strictly flesh. If God is spirit, then we are in a totally different realm, for lack of a better word, then God is. The world we live in is in a universe that is seperate from God's realm. I can't comprehend an idea of what God could possibly be, such as a literal clump of matter that me and you could see, or if he is all spirit and invisible to all or if he is everything. There are plenty of possibilitys.