There was a time he expressed genuine interest and belief in Christianity which I attribute nore to Bob than Barb. Bob was a Baptist from Texas at a time when they and the Catholics pretty much had a monopoly on community life in the state. Not to say other groups like Episcopal and Methodists, even a few Orthodox didn’t exist but those were overwhelmingly the two big religions in Texas and held most of the influence. Bob also likely learned a lot of humility and religion in the military.
But also remember that Bob wasn’t as nice to Chris, wanted him to actually do shit. Hell bob probably only set him up with the tugboat because Chris was useless at performing even basic tasks and Barb demanded they find Chris a source of income. Being an old and bitter man, he just got him to get the tugboat and said “fuck it”. Not gonna lie, I’d probably do the same in his shoes.
Bob also went to Church with Chris but Barb rarely did. My impression of her is that she’s one of those rednecks that don’t trust any organized religion or government. Bob was willing to go along with it for the community and experience while Barb wasn’t.
I’m analyzing this way too much, yes Chris is fat and lazy. Bob tried but he was old, tired, and impeded. Barb is terrible and everything she touches turns to shit.