Rev 14:
12 Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
Saints refers to the people of God.
While the whole earth is accepting the mark, the people of God are keeping the commandments of God.
In Rev 16 John sees that some of the people of God and true prophets are killed just before the battle at Armageddon.
So how does that work that the people cannot buy or sell without the mark?
Are you Seventh Day Adventist, too?
Simple yes or no question.