Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience, Ephesians 2:2. If I were to believe my Bible (and I do), I would say that the prince of the power of the air is right now working in every single carnal nature on this earth. He has an ally in American Fundamentalism that helps keep this obscure.
It never fails that if I listen to a man preach about the devil, he will always start with the caveat that the devil is not omnipresent. Where do they get that? At no place in the Bible does it ever say that, and at no place in the Bible does God ever reserve that term to himself. Instead, we have a verse that says that the prince of the power of the air is working simultaneously in every single one of the 7 Billion people on this earth who are subject to their carnal natures. I suspect that the belief that the devil cannot be omnipresent comes from the fear that God isn't big enough to handle such a being. I would be ashamed to have such an opinion.
Instead they conjecture a fantastic universe in which "demons" actually do the work and the devil just sits in command central. First of all, lets get this straight, there is no such thing as a demon. That is an NIV word for the King James word, "devil". There are fewer more obvious red flags that a man got his doctrine from commentaries, and not from Bible reading, then to hear him say, "demon". Demons are mythical creatures such as elves, fairies and leprechauns. Devils are fallen angels, and they exist. What they have not done, is divide the earth's population into sectors to keep tabs on men and report to the devil in an elaborate scheme to tempt everybody.
Let's reason for a moment. There are 7 billion people on this earth. If we gave every devil 100 people to plague in one day, 19,178 devils would be needed. If the devil were to give each of those devils equal time, he would need to listen to over 13 devils per minute, 24 hours a day, each one reporting on over 100 people. Maybe you can sit down and dream up a structure by which the devil could organize these legions of devils to facilitate this great task. When you are done you will have duplicated the work of mediaeval theologians who likewise constructed theologies which required structured ranks of bureaucratic angelic and devilish hosts to serve both God and the devil. Maybe you could save yourself the time to devise such a system and just enroll in a good Roman Catholic seminary where the work is already done for you.
Without all of these facilitators, if the devil were to give everyone equal time in a piecemeal fashion, and he dedicated one second to every person on this earth, it would take him over 210 years to tempt every person alive today. Do you think that the devil has given you more than a second of time in your life? Of course he has. Just believe the verse as it is written. He is currently, right now working in every single carnal nature on this earth.
When he convinced one third of the angels to rebel against God, don't you think that they had to weigh in their own minds whether or not this being standing in front of them could keep every single electron in every single star whirling away on its course? They had to consider every leaf that would ever drop in the Canadian wilderness, every fish that would ever swim the seas, every square inch of the vastness of God's creation, and they reckoned that the being standing in front of them was able to keep it going.
They bet on the wrong side, but God will not defeat the devil in an epic show of power, he beat him by dying on a cross and shedding his blood. Under the common law which was patterned after Moses's Law, when a man has an ox that he knows is dangerous, and he does nothing about it, he must pay the price for what the ox destroys. Do you think that God was surprised by Satan's sin? Do you think it caught him unawares? There came a time when the creator of this entire universe carried a cross up a hill to bear the entire responsibility for his entire creation. He won then and he will always win.
He made the devil to be able to inhabit every person ever born and able to challenge him for the control of the entire universe. If that was not enough, in the tribulation he gives him all power. Even him, whose coming is after the working of Satan with all power and signs and lying wonders, IIThessalonians 2:9. The devil has always lusted for all power and God will allow him to get it. Then he'll kick his butt anyway. The devil doesn't count on that sharp two edged sword in the mouth of Jesus Christ.
Suffice it to say that every person ever born, is born with a carnal, satanic nature that is upheld by the devil's own spirit residing in them. For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life, Romans 5:10. May God be glorified and thanked forever!