Mark of the Best is figurative for living in the world Satan crafted for us. We were all trapped at one point. The Doomsdayer crowd, like AJ and every TV preacher from the 70s till today were preaching shit like RFID chips, or barcodes for people to keep them from accessing their own bank accounts.
The mark means to live in sin. God's seal is on the foreheads of believers because it represents their mind is seeking God and his Hill on earth. If you are struggling with sin, like the rest of us are, keep seeking God.