Good day FullyLoved,
While it is true that the mark will not become manditory as the only way of electronic buying and selling until the middle of that seven years, the technology for it has already been revealed and is already in place.
Currently when making purchases, people swipe their cards or provide a cell phone bank app or some other device for electronic crediting and debiting, which the mark will eventually replace. Since 2015 we have already seen the use of the RFID chip implants under the skin of the hand, which will continue to evolve into something more applicable. I believe that the world explosion of tattooing and body piercing is meant to desensitize people to the coming mark on/in the hand or forehead. Since we are already seeing this technology, along with all of the other end-time signs, it reveals how close we are to the church being gathered, since we must be removed prior to the time period of God's wrath and the reign of the beast.
The mark will have nothing to do with DNA change, anymore than making purchases by swiping a debit card would. The receiving of the mark will be a willful, purposeful decision by each individual. To be clear, it can't be something that an individual has no control over because it would not be received by their own decision. In addition, scripture states that those whose names that were not written in the book of life from before the world began, will be those who will worship the beast, his image and receive his mark. So it cannot have anything to do with DNA change, but must be a willful decision on the individuals part.
One of the other reasons that they will receive the mark will be because without it they will not be able to buy or sell, which means that they would not be able to be apart of the electronic crediting and debiting system without the mark. Without it they will not be able to pay their rent/mortgage, buy food, pay bills, gas, etc. Without it they will not be able to even have a job or be apart of the world financial system because all financial transactions will be done via that mark. That said, they will seek to save their own lives more than God and in the process lose eternal life.
Those currently in Christ will not even see the antichrist nor be exposed to his mark, because the church will removed prior to that time period. Those in Christ who will be here during that time, will be those who did not believe in Christ prior to the gathering of the church known as the great tribulation saints, but will become believers after the church has been gathered and during the time of God's wrath and the beasts reign. They will not worship the beast, his image nor receive his mark, but will keep the testimony of Jesus and the word of God with many of them being killed for their faith. Regarding the mark, I personally believe that it will be physical but hidden under the skin of the hand or the forehead. However, it is possible that it could end up as a circuit board tattoo or something similar which would be place on the top of the skin, the end result being to be able to electronically credit and debit ones bank account.
Regarding the seal in the forehead, this will be only be for those 144,000 from the twelve tribes of Israel. This seal is not the same as the sealing of the church with the Holy Spirit, but will be a literal seal on the forehead and as previously stated will only for the 144,000. This means that everyone else on the earth during that time will be exposed to this time of torment, as well as the rest of the seals, trumpets and bowl judgments.
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