For arguements sake, say the scientists got it wrong. That the zombies are not from a virus, but are supernatural in origin. The End of Days type. Science just doesn't work on them.
A new field of research could entail how to use theology instead of science to gain the advantage and develop blessings and rituals to stop/end the zombie threat.
I'm going to noodle it through a bit when I get the game, play it a few times, and see if it is a feasable variant.
Just food for thought,
your idea's interesting i just don't see how you would "research" blessings? ancient scriptures? divine inspiration?