Anti-Sanguis Astroism would work though, if that's what your main concern is. Heck, I think you could even get away with calling it Anti-Sanguis Astroism (Protestantism really does mean what it sounds like you know...)
If by that you mean that you hold the influence of the Blood Stars to be evil, then yes. A religion that says "Sanguis Astroism is evil because they're totally taking over the continent!" would
not be a good plan. Now, you could, I suppose, have a Balance based religion that thought Sanguis Astroism was upsetting the balance of the world, but religion = theological first, political second.
