The act of accepting it (the chip or tattoo) is the Mark of the Beast. Whether it is removed at some point is irrelevant. The fact that you initially accepted it and took Satan’s path and rejected the gift of everlasting life is the indelible Mark of the Beast.
The consequences of receiving the Mark results in our being separated or unable to persevere in our fellowship with God.
IMHO, the mark will be used to intercept our prayers of confession and repentance to God for post salvation sin. It will be introduced as a method to control commerce such that no transactions may be conducted independent of the Mark.
It may be connected to neural research and communication technology. Once implemented, even the most advanced military will respond, “who is able to make war with him?”
It is the Beast which is given power for 42 months.
It isn’t simply an initial act of denying Christ. Every time we ever sin, we are fundamentally thinking independently of God, His Provision, and are against Christ. We still have the ability to return into fellowship by repentance,..changing our way of thinking, and confession to Him, through faith in Christ.
Instead, the mark will be an attempt to counterfeit our ties with God. This also nicely explains why it will be met with the Great Tribulation and violence.
Perhaps it is nothing more than a tattoo, used to somehow permanently interrupt our ability to have fellowship with God.