Yes, it should have been ~b -> necessarily ~q.

LOL. The idea that someone might actually expect an unpleasant life after death reminds me of some sort of twisted comic plot: the protagonist who's confident that they're going to hell so tries to postpone eternal suffering with cryonics.

Seriously however, you're right. Here's another possible qualification: are we talking about a finite or infinite life after death? In light of these possibilities, I changed "c -> necessarily ~q" to "c -> possibly ~q". I can't change the wording of the question "Is there life after death" because that question in its simple general form is already used in many other contexts on TakeOnIt. At one point I'd considered allowing annotating an implication (e.g. to express qualifications, exceptions, etc.), but the complexity of the feature didn't seem worth it.