The Water Walking Jesus scene...you know how Ennis asks about the Pentecost, and Jack says he thinks "fellas like you and me march off to hell"?
Well I didn't know what the Pentecost was, so I looked it up, and I found this:
http://www.stpaulskingsville.org/pentecost.htm
Jack's interpretation seems way off...was he just trying to create an opening, to test Ennis, see what kind of reaction he got? (Let's face it, he got a good one 
)
I think it's safe to assume, Kitty, that it's Jack's ignorance about a major event in the New Testament that is being displayed here rather than anything more devious. It certainly looks as though Jack's mother has a Pentecostalist background - I have been assured that the type of crucifix seen on her living room wall would be typical of a Pentecostalist household - but little of this seems to have been transmitted to her son. Ennis, somewhat disingenuously, claims that he wouldn't know anything about the Pentecost as his parents were Methodist but even an ordinary Methodist would certainly know the story of the Pentecost.
All in all, I suspect what we are being shown is a younger generation who have become disassociated from the beliefs and churches of their parents. They are not necessarily agnostic or atheist but simply disinterested in things religious.
However, once married, it is clear that Alma has dragged a very reluctant Ennis back to church and I suspect it's the church of Ennis's parents - the Methodists. We know that Alma Jr. is to be married not just in church but in the Methodist church, so it would make sense that that was the church the girls had grown up in. Ennis's reluctant association with of this group comes through on a couple of occasions. On one Alma Jr. is pleading with him to take them to the church picnic which Ennis only agrees to provided he doesn't have to sing. (What Ennis has against singing remains a mystery). On another, Alma is encouraging Ennis to get dressed up so they can go to the church social but Ennis dismisses those attending as "that fire-and- brimstone crowd".
However, if Ennis attends his daughter's wedding, there will be one thing to his advantage. He won't be called upon to sing. His younger daughter, Jenny, will be doing that.
