Jordan Frith, Associate Professor of Technical Communication from the University of North Texas, has investigated about radio frequency identification chips (RFID chips) in his book named A Billion Little Pieces: RFID and Infrastructures of Identification

He related how these tiny items have been related to the doomsday that will happen in the future according to Revelation, the last book from the Bible. 

RFIDs are invisible electronic devices that are used in tagging pets, electronic tolling, passports, and even as hotel keys. 

According to Live Science, "FID technology is a method of wirelessly, digitally identifying objects - like luggage, cars or subway passes - that often does not require any internal power source. A small chip is inserted into or attached to an item to be identified - like a duffel bag or a toll pass transponder. It does nothing until it passes near an RFID reader, which can be a few inches away for passports, or several feet away as in highway toll barriers. The reader emits a specific radio frequency that activates the chip, which then transmits its digital identification code."

In 2018, an estimated 10 billion tags were used worldwide. The huge market of RFIDs can be seen in clothing stores that monitor theft and inventory. 

Owners have their pets microchipped with RFID as well as humans chip themselves in order to communicate digitally. The latter is what makes evangelical Christians angry.

In Revelations 13:16-17 (KJV), the Bible states, "And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads: And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name."

This biblical passage relates the use of RFID chips with the mark of the beast. Evangelicals linked RFID to the mark. 

The author enumerated the relationship because of two reasons. "First, when biohackers chip themselves, they typically put the RFID chip into the palm of one hand because it's easy to wave that at sensors to open doors or process payments, and the scripture specifically mentions the mark on a person's hand. In addition, some people have injected RFID chips containing credit card payment information, which calls to mind to the payment methods mentioned in the Bible."

With this perspective, even privacy advocates are against the use of RFID as these violate the right to privacy.