I’ve spent a large amount of time studying this from a Catholic Perspective. One of the Doctors of the Catholic Church has written on this topic. His name is St Robert Bellarmine. His writings are not in English and I was not able to find a complete translation. But I have found people who came up with ideas and used his writings to back them.
Some pointers when studying the book of revelations.
First off, remember that the Catholic Teaching on the book of revelations is that it encompusas the whole time referanced as the last days, not just a small part of it at the end. This means it is from when Jesus was here the last time, until he comes again. This is why people can always point to what is going on and say, see it is in revelations we are near the end. Of course something is going on that is in revelations and something will always be going on in revelations until he comes again.
Second off, it is written in symbols. I am not for reading most of the bible as symbols, like I believe the flood really happened. However, revelations from its inception was intended as an apocrypha type writing. Which means the symbols have meanings.
Third off, it is written in categorical not chronological order. It was a common writing style of the time. Therefore the events appear the jump around.
Now you asked about the mark of the beast being the biochip? Like some have already mentioned, I don’t care what the Church teaches, common sense is that it goes against natural law. And the Catholic Church teaches that violating natural law is a sin.
666 actually written in original text DCLXVI which is important when deciphering the meaning. It is not 6 6 6. In short it means a covenant with death. It is symbolic for death to promise not to take you (That is from a Jewish commentary of what the number would mean to the Jews at the time). Notice later in revelations the people who take the mark are tossed into the fire alive.
A little in site into the biochip which is now being marketed as the Universal ID chip. It can literally communicate with your DNA. And from very reliable sources, I’ve been told the biochip can be programmed to make somebody never die. Furthermore, it will include an RFID chip so they can always identify you and a gps chip so they can track you.
Furthermore the people in the government who try to promote it, even call it the mark of the beast in private. I know that because I know some of them.
I think it is hard for anybody to deny the biochip will be the mark of the beast. Private or not, the evidence is overwhelming.
If somebody believes it will not be the mark of the beast, I would like to hear why.