The Mark of the Beast is the Mark of THE BEAST.
If you know who THE BEAST is, then it is easy to know what the Mark is.
THE BEAST is Rome and the Mark is Sunday.
Believers cannot Buy or Sell on Shabbat unless they keep Sunday instead.
Also, False Teachers cannot profit in the business of religion unless they first bow the knee to Rome and keep its false sabbath.
the Beast is Islam. Not Rome. there are no scripture that you can show that say any western nation is anti christ. All nations that the Messiah come to war with thoughout the bible are Islamic nations. Muslims wear a hand/armband and a head band that says "in the name of allah".
Daniel 11:30-32 "For ships of Kittim shall come against him, and he shall be afraid and withdraw, and shall turn back and be enraged and take action against the holy covenant. He shall turn back and give heed to those who forsake the holy covenant. Forces from him shall appear and profane the Temple and fortress, and shall take away the continual burnt offering. And they shall set up the abomination that makes desolate. He shall seduce with flattery those who violate the covenant; but the people who know their God shall stand firm and take action."
KITTIM is the translation for ROME.