Yes, many already have the MARK OF THE BEAST - the Spiritual version. If you honor Satan knowingly or unknowingly, you have it. One day that spiritual mark  would be upgraded to the physical mark if there is no genuine repentance.  (I believe per scripture that the mark of the beast will wind up as a physical mark visible by the physical eyes and distinct to everyone who’s on whichever side). This would be at the time the ANTICHRIST would be revealed and he would insist on it for those carrying his spiritual mark and would also deceive lukewarm Christians into taking his mark (Revelation 13). You will only be able to resist that mark if you are passionately on fire for God meaning your name is written in the Lamb’s book of life and you are sold out for God not caring about losing your life. And note that at the point of physical mark, once you take it, it  cannot and will not be reversed. This is it!
Good news is that right now the spiritual mark can be removed!  This happens when you receive Jesus Christ into your life and receive His Holy Spirit and you then remain grounded in Him! 
Therefore, this is the right time! (NOW is the day of salvation!!) as there will come a time when it would be way too late! God’s judgement on sin and on the wickedness of this world will be terrible. We haven’t seen anything like it. (Matthew 24:21; Zeph 1:14; Amos 5:18-20; Rev 6:16-17, Rev 9:20). So turn your life over now! Or if you believe you are saved, surrender COMPLETELY to Him. Give your WHOLE LIFE, holding nothing back!