666 is about DEATH and Agreement with DEATH, especially in so-called 'CHRISTIAN' or 'CATHOLIC' Churches.
Devilish people are not always as frank as Nazi soldiers were, belonging to Security Squads, with their Skulls & Bones on their shoulders; devilish people are mostly cowards and hypocrits who are hiding their intentions to their own children.
That is why the Apostle Paul does explain that DEATH is the result of SIN - and Jesus-Christ: 'Let the DEAD bury their DEAD' (Luke IX, 60).
(For more details, read this blog -in French- or Christian Theologian E. Swedenborg's explanations about the Book of Revelation; E. Swedendorg did not belong to any HUMAN CHURCH)