I think that's a great question.
He hasn't been back, so he must not like our ideas. Maybe he realized something about himself?
If it were me, I wouldn't like the idea that I would have to miss church on Sunday once in a while, since it would be a mortal sin.
Though I've committed many sins, and still do, my thoughts were that she may not want her husband there, if he isn't going to eventually convert. I wouldn't want a wife of mine to go, if she was made to feel so terribly by it. It would be worse to put up with that, than to go alone or with a friend/relative.
I think they need to talk about this at length and with as much openness and honesty as they can stand. It seems that important.
At the basis of many of the posts is compromise, and I do believe that's the right direction to take. Whatever that looks like, they'll have to decide.
In the end, if he is so upset that he starts a thread on it, maybe he should consider divorcing her before they have children who will see all the arguments about whether or not they should be taught his or her beliefs?
For me, it's really sad because a little openness and honesty could easily have circumvented this before marriage.
"I'm significant!! Screamed the dust speck." - Bill Watterson
"And this, too, shall pass away."