Because they have deceived everyone into believing the most fantastical fabrications about themselves, religiously and in the greater social order. The bible even tells us they are antichrists and most Christians are completely oblivious. Yet Christians go looking around expecting someone else to appear as antichrist. How they can maintain the veil of deception in every aspect, theologically, racially, and socially, truly does tell me there is an air of something evil about them. Jesus directly rebukes every aspect of their deception. Pagan transliterates as, "without God." I assume people believe they are with God because they tell everyone they worship God. But the bible says the exact opposite. The bible says if you do not have the son you do not have the father. If you do not have the father you not have the son. According to the bible they are "without God." That squarely makes them pagans.