What is sin? Sin is a conscious, willful, intentional act or thought of breaking God's Law. Things, in and of themselves, are not a sin. For example, is accepting a sword a sin? No. It is what you willfully do with the sword that constitutes a sin or not. Is a neighbor's wife sin?

if the government does force people to accept a literal mark in their hand or forehead, it will be wrong to accept this mark, but not for the reason that the mark itself is a sin. There is no difference between a literal mark issued by the government, or a license issued by the government. They both force you to enter into a legal "contract" with the government to place man's law above God's Law. In other words, if there is a conflict between a man made law and a Law of God, the government says you must obey man rather than God, whereas God says we must obey God rather than man (Acts 5:29). This is the reason why it is wrong to accept anything from the government. If you accept a license, benefit, privilege, certificate, etc. from the government, you are legally bound to obey all of their rules, regulations, ordinances, statutes, and laws, no matter how anti-Christian their laws may be