So you really think that John saw someone gettign an RFID chip implanted in his arm and mistook it for him having a barcode pasted on his forehead ?
Here are the verses
Rev 13:
16 And he causes all, the small and the great, and the rich and the poor, and the free men and the slaves,
to be given a mark on their right hand or on their forehead,
17 and he provides that no one will be able to buy or to sell, except the one who has the mark, either the name of the beast or the number of his name.
("he" is the second beast)
The only things needed is a way to make permanent marks on human skin and enforcers to prevent anyone without the mark trading. There is no need for any technology more advanced than tattooing for the mark
Note that the mark includes EITHER the name or the number. UPC Barcodes only have guard marks that resemble an ENCODED six, and have no provision to encode names - and they are not going to be put on foreheads or hands. So the Bible as good as tells us that the mark of the beast is NOT a UPC barcode.
It is a mark on the right hand or forehead so it is not an RFID chip. They are not easily visible, and more likely to be implanted in an arm.
It is not described as a means of personal identification, nor any sort of financial record so what use could it be in trade ?