And yet Jesus never knew them, which means they did not belong to Him. Perhaps it is best not to assume what the text does not say. For all we know they were prophesying in Jesus' name for their own ego's sake. Satan masquerades/disguises himself as an angel of light.A reasonable assessment of someone who prophecies in the name of Jesus, is that that individual supposed the basics of declaring Jesus as Lord and believing that God raised Jesus from the dead. If they did not believe in these basics, they would never have prophesied in Jesus' name in the first place.