Is he a believer also? I was off work one week and my wife got upset with me because I kept using dishes. My mug had broke and every single glass looked alike. I didn't want to drink out of a glass that had had milk in it in the morning or a glass other people had drunk out of. And I washed dishes, too. It was silly to get upset, but after several days, there was this seething tension between us. I suggested we pray and humble ourselves. We prayed and I asked the Holy Spirit to go to work on our hearts and confessed sins to one another and made up. All that tension between us was done away with just like that and we were okay again. You can suggest doing this with your husband.
If you were nice to your husband and he thought you want to argue, that may tell you something. Even if he is hard to get along with, usually, it takes two to argue. I know there are some people who can get upset just at normal conversation and a lot of people can be that way when they are tired and hungry. But there could be a way that you approach him that you could change so you aren't so argumentative. Ask him if you were the ideal wife, how would you act, and what areas do you need to change to be an ideal wife for him.
He may not know everything you can do. Men like to be respected. You can make sure to be gentle and not too demanding with any criticism. You can also serve him in various ways, making things for him. If you are getting along, a lot of men like hugs and kisses, too, just like women do. Of course there are other physical activities that men may appreciate their wives being available for when they are interested. Praise and encouragement are also appreciated. You can tell him how good he looks, how much you appreciate his working hard to support the family. Find positive traits and praise him for them.
If he's a believer, you can talk about the divorce issue by pointing out what the Bible says about divorce. Then ask him for a list of things you can do to be less argumentative and to satisfy his needs. Remind him what he said about your being fake when you are nice and thinking you wanted to argue. Tell him you don't want to be argumentative and just ask him for the behaviors you do that make him upset? Is there something about the way you talk to him? Is there something about your body language? If you make up first and then change your approach to how you talk to him, you might see some improvement.
Here are some ideas. If you have a problem with him or his family, don't just have a normal conversation with him about it. Definitely don't get forceful in the way you talk. When my wife and I first got married, if she didn't like something I'd done or said, we'd be laying on the bed after spending some time together, ahem, and she'd gently say, "can I tell you something?" Then, very gently, she'd tell me something I did that she didn't like and how it made her feel. That's a good approach. She hasn't always used that approach, though.
But that one works best.
Something to avoid is repeating the problem over and over and over again. And avoid talking about problems after 10 PM. That's when a lot of domestic arguments start, after people are tired and cranky.
There are a lot of other things you can do to help him feel better about the marriage. Make a drink he likes before he gets home (assuming you are there first). When he comes in, greet him happily at the door with a big hug and kiss. Ask him if he'd like to sit down and have a glass of lemonade or whatever you made. Then if you want to talk to him, sit at his feet on the floor, lean against him hugging his legs or something like that, and tell him gently what you want to tell him. That's non-threatening and may trigger some kid of protective instinct on his part.
I do notice a lot of 'I'm not going to tolerate X, Y, Z' type language in your posts. If you are taking that attitude toward him, then that can lead to arguing. I know it hurts if you want to comfort someone you love and that person rejects your comfort. But his needing to grieve over his parents is a bigger need. Instead of trying to hold him accountable for not accepting your comfort, you could tell him you are there for him if he wants to talk, hug you, kiss you, or for you to comfort him in other ways, and then back off. You can offer, do you want me to do X for you and thing like that and be very nice to him.
The children issue is a very difficult one. It's hard to listen to someone talk about your kids. He may feel similarly if you criticize his relatives and how they treat you.
I'd also like to encourage you. I've been through some times in my marriage when there was tension between us and we weren't getting along. Right now, though, it feels more like a Honeymoon couple and we have strong feelings for each other and get along fine. If you aren't getting along now, that doesn't mean you won't be getting along really well and enjoying marriage later.
I'd also like to point out that there is a blog and videos called The Peaceful Wife. The woman who runs it has a blog for husbands, too. I think some of her blogs and videos on how she learned to respect and get along with her husband could be helpful for you. You can look up her blog online or her videos on YouTube.