It's not the mark of the beast.

Deuteronomy 6:6&8 And these words, which I command thee this day, shall be in thine heart: 8 And thou shalt bind them for a sign upon thine hand, and they shall be as frontlets between thine eyes.

Commandments are a sign upon your hands and forehead. The mark of the beast is about who you worship. That's why the book of Revelation says:

Revelation 14:9-11 And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, 10 The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb: 11 And the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name.

The mark of the beast is a spiritual law about WORSHIP. That's why those who don't receive the mark are those who keep God's commandments, and have faith in Jesus.

Revelation 14:12 Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.

The mark of the beast is the enforcement of Sunday Worship.