- Fetal Cell Tissue, apparently there is some use of it in the development pipeline such that quite a few contemporary religions can use that as an out.
- Mark of the Beast, given how forceful government have been (varying on location), one could make the argument that this represents the Revelations concept of being forced into some system of submission to Satan in order to live and so it is their duty as good Christians to resist this.
Regarding the first point, I’m not sure if any other DOD related vaccines fall into this category but one could argue their religious beliefs came after their initial military indoctrination.
Regarding the second point, the existence of a religious exemption somewhat weakens the argument but then again one could claim that the battle against Satan is ongoing and the system incomplete.