Religious exemption is not widely supported. Many locations do not have religious exemption. And supporting documentation of covid antibodies is creating a massive moral hazard for anti-vaxxers.

Delta is infectious enough that we must assume that every unvaccinated person will get it. Telling people that they will be able to rejoin society after they're vaccinated or they get covid will result in people avoiding vaccination, which means saturating ICUs as those people get covid by happenstance or by deliberate action.

There are people awaiting critical surgeries who cannot get it because of the lack of ICU space.

Triage is a crisis right now in many infected regions Remember, if R is greater than one, and you can expect to get covid as an unvaccinated person, then that means that by staying unvaccinated you are de facto planning on giving somebody covid.