Yeah, in the book of Revelation in the Bible as a sign of the end times followers of Satan will have a visible mark on them. Many evangelical Christian conspiracy theorists believe that in a literal sense. Paired with many conservatives also not wanting the government to be able to track them, a national ID system (as opposed to state IDs) has never really gain traction.

You can read more about this here if you’re interested. https://en.wikipedia.org/wiki/Number_of_the_beast#Mark_of_the_beast

Some fundamentalist Christian groups, as well as various Christian writers in other traditions, interpret the mark as a requirement for all commerce to mean that the mark might actually be an object in the right hand or forehead with the function of a credit card, such as RFID microchip implants.[73] Some of these groups believe the implantation of chips may be the imprinting of the mark of the beast, prophesied to be a requirement for all trade and a precursor to God’s wrath.[74][75] Similar objections were raised about barcodes upon their introduction.[76]

During the COVID-19 pandemic, some groups associated COVID-19 vaccines and mask wearing with the mark of the beast, or that it was a microchip in the vaccine.[77] Some religious leaders spoke out against this as a misinterpretation of Revelation 13:16-18.[78] Medical institutions such as Hennepin County Medical Center noted this in their fact sheets about the vaccine.[79] A similar version was spread by Marjorie Taylor Greene, who referred to vaccine passports as being the mark of the beast.[80]