“And more specifically” ~ RobRoy.
I prefer my specifics:
http://www.freerepublic.com/focus/f-religion/1983867/posts?page=85#85
So it is a command of God not to number His people.
Now note, this is His people, not the rest of the world.
Christ has numbered all who are His with His blood. He knows who they are. Mankind does not know who they are.
The only way that you can identify with "the Beast" is to think (forehead) and act (right hand) like the beast. When you don't, but live as a holy people separate from the world, you will endure persecution. Or you can fit in with the crowd, it's your choice. The elect will never do it.