Those who oppose God now are being marked also. (Revelations 13:3,16,17 Revelation 14:9,10 .
If you read Revelations 13 and 14:1 you will see that the mark is the name of something in a position of authority. A human government. It will have authority over the whole earth. The number represents a name. The number seven represents fullness or completeness in the bible. For example God completed the earth on the seventh day. In Matthew 18:22 Jesus emphasized the importance of forgiving someone completely by stating seventy seven times we must forgive someone. So by having two sevens side by side it emphasizes how complete the forgiveness must be. If the number 6 is not reaching the mark then it represents the incompleteness of that Government. Since we are imperfect humans then our rule cannot be perfect like a government set up by God. So the number 666 represents a government that will have authority over the whole earth, it will be a human government that is trying to replace God’s right to rule over man. So just like Adam and Eve’s rebellion in the garden of Eden when they thought we didn’t need God this will be the ultimate rebellion.
Revelations 19:1 Tells us that the beast and those who received the mark will be cast into the lake of fire.
Which mark are you choosing to receive?
If you want to know more go to http://wol.jw.org/en/wol/h/r1/lp-e and search for “mark of the beast or 666”