This may sound controversial or even abhorrent to some but I propose that when it comes to people with Christian religious beliefs (which form a significant portion of people in the former “free world”), these religious beliefs should be intentionally and aggressively utilised by presenting any attempt to introduce a digital ID as the “mark of the beast” as described in Revelations 13:16-17:

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.

The messaging should be adapted to the fact that digital IDs will NOT be an actual mark on the body or something implanted into it (at least not initially) but it should still be presented as equivalent to said “mark of the beast” in every practical way (especially around the ability to buy or sell and engage in employment) and thus accepting it will have the same implications for a Christian person.

For people with such religious beliefs, this messaging will resonate much more (and thus be much more effective much quicker) than any generic attempts to scare them off having their personal data on the Internet or even using the Internet altogether

Controversial? Maybe.

Effective? 100% GUARANTEED (imho at least).