God and Jesus and the angels are spirit just like Satan and the demons. What differentiates God from Satan? God is good and Satan is evil, they have different light frequencies and electro-magnetism? The answer may be impossible to know. By the way, God allowed the angels to come down to earth and become men to marry the best women and leave the ones that were not so good for real men to marry. Then the earth become so violent and the people, nephilim, were all up to no good. My question, why did God allow this to happen? Didn't foresee that this was only going to cause problems? Then God was sorry that he created the earth and everything in it and wiped everybody out but Noah and his family. (Genesis chapter 6). How God could allow that to happen and then regret it is very hard for me to understand. God is doing it again according to Revelation chapter 12. The heavens are very glad that Satan and his demons were sent to earth so that they don't have to to deal with them anymore even thought they are 1000 times better equipped than us to deal with the demons.