Because he's raging on the internet about his wife going to church, giving us one side of a story, while also having apparently been kicked out of the church for some reason only lightly alluded at.
I've been moderating online spaces for almost 3 decades now, when people have some passionate claim or complaint, you're likely hearing a fraction of the truth.
I don't know if you are male or female, married or not, but I'm hazarding a guess that he hasn't tried to have just a calm, civil conversation with her about it and instead, "well God said, the Bible says, you're wrong, I'm the man" based on several men on this forum and the simple fact that many of us men are stubborn and will argue until we pass out instead of trying to have a civil conversation about a clearly heated issue.