The Mark is only visible to angels, has been around since the beginning, and it is the opposite of the Mark of those crying out for sin (see Ezekiel 9). The evil Mark is APOSTASY made to look as if it were Christianity, the placing of the Abomination of Desolation, also known as the Image of Jealousy (Ezek. 8) in the Gate of the Temple.
No one can obey the Commandments perfectly. If that were the case, then God the Word was made flesh for nothing. Only God cannot sin. This is why Christ Jesus did not sin. He not only remitted the sins of His people, but He also fulfilled all the required righteousness. It is this Righteousness that is imputed (accounted) to all those for whom He died.