Originally I asked if Christianity served to make the Devils/Satans strive to achieve dominion over earth easier. Since then I have become aware of passages where Jesus states that the Devil is in fact the God of this world and that there is no objectives for the Devil to actually strive for. The Devil has won almost from the beginning of time. None the less, the Devil being just a clever Angel has no power over anyone unless it is granted voluntarily.
You would think that with a world population of many Christians that it might become clear that the Devil can be resisted and in fact ordered around by humankind. That is not the case. It seems that Christians do not understand the power that Jesus has given humanity.
Jesus said that the devil comes only to steal, murder and destroy. Wherever we see murder, destruction, and theft of property we know the Devil is at work in the minds and hearts of those carrying out the atrocities. We can collectively rebuke the demons out from the evil doers whichever flag they wave. We can do so through social media. We also have the opportunity to video people, their expressions and actions while possessed to study later in our schools and mental institutions. We can interview them while possessed and after the demons leave. We can witness.