IF you believe the Bible —and I do, then the stories of Jesus and some disciples dealing with demonic possession, if studied carefully, will lead to the conclusion that demonic possession is not only real, it may in fact be heralded by ‘physical disease’ ... we have no idea how big or small demons are in existence; they could be cellular level invaders, as Jesus ended physical illnesses by casting out demons.
God kicked Satan out of Heaven and a third of the angels went with him. That means for every angel that follows Satan, there are two who follow God. And, yes, I believe in demonic possession.