S.B.
Would he be willing to go to counseling? Would he talk with the pastor? It sounds like he's become disenchanted with not only you...but his spiritual side as well.
It sounds like he's got something going on and he's definitely putting up walls.
Maybe he just needs some space? Have you tried talking to him about it? Not nagging...not fighting...just sitting down and telling him you love him and you want to have a relationship again.
Good luck.