VR: "And if someone believes in hell, it then gets problematic to argue that they ought not to teach the doctrine at all (keep it secret?). At most one is left with the constraints about age-appropriate teaching, which I was trying to cover in my post."
Bill S.:
I don't find it problematic at all to argue that people who believe in morally repugnant notions ought not to teach them. If a concept is morally evil, then it shouldn't be taught as good, period. Whether a person believes that concept to be good is wholly beside the point.
Parents who are KKK members and believe that miscegenation is morally evil should not teach such rubbish to their children. That they disagree is beside the point.
Your point about different views of the doctrine of hell is well taken, I think. However, if we were to agree that a doctrine of eternal torment was morally repugnant, would we not also agree that it should not be taught to anyone (as true), much less children?
VR: I think some of the discussion has gotten a little off track here, and I think I ought to get it on track.
First, we might distinguish between ways in which we might assess different versions of the doctrine of hell.
1) Doctrines of hell which are morally coherent and at least plausible from within a Christian perspective.
2) Doctrines of hell that, in the final analysis, are morally incoherent, but which can be held in good conscience by at least some Christians.
3) Doctrines of hell which are morally incoherent, and where the moral incoherence should be evident to anyone who reflects on it.
I realize that there are arguments for the claim that no doctrine of everlasting punishment falls into category 1, and that this case is made not only by atheists but by universalist Christians like Tom Talbott. Another position might be that while the DEP may not be incoherent, many popular versions of the doctrine are morally incoherent. If the missionary's truck broke down on the way to the village before the dying man preached the gospel to him, and he ends up in an eternal torture chamber rather than in eternal bliss because of it, then I've got to be concerned about the concept of eternal punishment in use here.
Another example of a doctrine that I find morally incoherent is Calvinism. In spite of the biblical and moral arguments which I have heard over the years, this view just seems to be just completely incoherent morally. It's a view that leaves me just shaking my head at how anyone can actually believe that God can do that and be good. And yet, I know that there are Christians of good will and good conscience who believe it.
I'm not saying this to launch a debate on that topic. I'm saying I would oppose the claim that people who believe this should refrain from teaching it to their children. That's what they honestly think is true. If they don't teach it to their children, they would be liars. It now becomes a matter, and a matter only, of how they teach that doctrine.
Suppose, however, the doctrine could not be held by a reasonable person. That is what Bill is suggesting when he talks about the KKK and people who oppose miscegenation. The problem here seems to be that the doctrine shouldn't be believed by any reasonable person. But if, my some intellectual failure, it is believed by someone, I think I would still have to say that you can't argue that it is wrong to teach the honest truth to one's children. The error, the intellectual dishonesty if that is what is involved, occurred when the belief was formed. I don't see how you could give someone a reason not to teach some particular version of the doctrine of everlasting punishment to children (even a version of it that you or I might both find detestable) without at the same time giving the holder of the belief a reason to abandon the doctrine itself.
If I fire a gun at someone I think to be and armed robber, and I shoot an innocent 15-year-old boy instead and kill him; if we assume that I am within my rights morally to shoot an armed robber under these circumstances, then depending on how I formed my belief that the moving object over there really was an armed robber, I could be morally in the clear for firing the shot, even though an innocent 15-year-old died as a result.
You have to act on the beliefs you have, not the beliefs that someone else might wish that you had.