The mark of the beast is not here because the antichrist is not yet in power. First, the rapture of the Church has to happen, so Christians are safe in Heaven when the final beast will reign over the world. But someone who is here on Earth that with it's power is preventing antichrist to take over the world. And that someone is the Holy Spirit. 2 Thess. 2:6-7 ‘And you know what is restraining him now so that he may be revealed in his time. For the mystery of lawlessness is already at work. Only he who now restrains it will do so until he is out of the way. So we can see here that the Holy Spirit is restraining the antichirst. The Holy Spirit has to depart Earth so the antichrist can be revealed, and in that moment the Great Tribulation will happen. When will the Holy Spirit depart? When the rapture happens, why? Because the Church will be taken to attend the Supper of the Lamb in Heaven, so He is no longer needed here on Earth. That's why He arrived, for the Church, when the number of Gentiles is fulfilled, then He will leave with the Church during the rapture. All of the Christians who are not reborn in Spirit, they love Jesus but they love their Earthly lives more will be left behind when the rapture happens. But God is fair to them, He will give them another chance. How? By resisting the antichrist. If they proclaim their love to God and are willing to lose their life for it, they will, and they will go to Heaven. Someone might argue with me like before that God doesn't give second chances...uhm yes He does, while you are still alive you have a chance to repent. But because you didn't love God first, you lived your Earthly live more, the consequence of that is that you have to live durng the Great Tribulation. So don't worry, until the rapture happens you don't have to fear this mark because antichrist is not ruling the world...yet