It's not that vague though. People tend to think the Bible descriptions and prophesies are metaphorical but they're pretty literal and straightforward.

People will have the mark IN their right hand or IN their forehead in order to buy and sell. It's much more likely this refers to the CBDC NWO system and the chips that eventually will become mandatory. It has already been demonstrated the barcode delineation lines read 666. First they've been put on all products and now every person will have such a barcode embedded in them.

No one can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon. Mathew 6:24

Israel has a different part in the end-time events. They will rebuild the Temple of Solomon and declare their king the Antichrist as the leader of this world and demand everyone to bow down before him. This period will last 3-3.5 years and Christ will come. This last part is a prophesy by St. Paisios of Athos from 30 years ago.