I am a bit late to this party and I like @elle
s comments in particular.
You are both young and at this stage is marriage it is sometimes tough even when you are on the same page. The 'seven year itch' was not coined for nothing!
You do not spend/invest enough time in each other in terms of dates, one on one, etc.
You pulled a bait and switch, she married a devout Christian and is now lumbered with a porn watching, alcohol drinking, part time church goer, so yes she has lots to complain about.
In addition you have three kids who need a leader, she cannot do it alone.
The thing you have to remember is that your wife is frustrated, filled with resentment hence leading to the disrespectful belittling of you which is a vicious cycle.
I think this is fixable if you both do the work. You should both listen to Dr Eggerrich Love and Respect Podcasts. Your wife needs to know she cannot control you, and can only take care of her side of the road. Ask her to talk to a women's group about this and perhaps read the Respect Dare.
As for you, you need to shape up, you could lose your family. if you are having a crisis of faith go join a man's accountability group of similar group. You should read the Love Dare