The Mark of the Beast vs The Seal of the LORD
There will come a time when Revelation 13:16-17 will be the law of the land. Most people will take it willingly. After all, they need to take care of their families and God will understand. Will HE? But that is for the foolish and the people that Satan has deceived, saved, and unsaved.
This mark will be in the right hand and in their forehead. WHY? both? I know some Bibles have if (or) but it is both. There will be two witnesses to a person having the mark, 1. their hand 2. their foreheads.
What about this hand why would Satan want that?
Because people put their hand to whatever god they serve. And we are not saved by works but we stand before the LORD for the works we have done out of LOVE for the LORD. We don't bost on what we have done, but what we are willing to do for faith without works is dead. We can't help ourselves.

Deuteronomy 15:10 KJV
Thou shalt surely give him, and thine heart shall not be grieved when thou givest unto him, because for this thing the Lord thy God shall bless thee in all thy works and in all that thou puttest thine hand unto;
Satan is making it known that you have put your hand to get Satan's blessings and curses, not the LORDs.

WHAT about people who are REALLY SAVED and SERVE The LORD?
They won't get the mark because the LORD has already given them a seal in their foreheads that they belong to HIM. They will have to give their lives to keep the Seal of The LORD.
Revelation 9:4
King James Version
4 And it was commanded them that they should not hurt the grass of the earth, neither any green thing, neither any tree; but only those men which have not the seal of God in their foreheads.
Men and Women, who have the MIND of Christ what better SEAL is there? To BE LIKE Jesus the Messiah who can take you from the LORD's HAND? For the Hand of the LORD has put to finishing what HE has started in YOU! Just a thought. ?