My husband and I just went through this same type of situation. Our son is was about 11 months when it finally came to a head. I already had an apartment in another state on hold for the baby and I. Then I sat back and decided that it wasn't worth it. Like some one else said I realized how much harder it really would be with out him. (not that I couldn't do it, but just don't want to have to).
We are not religious, and come from two very different backgrounds, as well as the fact that my husband is adamently against counselling. I was the one who had to start the change.
So one day I just stopped fighting. It was really hard at first, but once I started to see results it got so much easier. I would get upset about something..(i.e. he didn't do something, not helping, or bills...etc.) and I would very calmly, in the sweetest voice I could muster, go to him to tell him that I was having a hard time and needed help. Making him feel needed was helpful, and I realized I had just spent half the year making him feel like I didn't need him and only wanted him around for the crummy jobs in the house.
When he started to get mad about stuff and fly off the handle I kept my mouth shut and just listened. (no matter how mad anything he said made me). The only thing I would say is "could you please keep it down, the baby doesn't need to hear this, and Im right in front of you" After he was done venting I would just let him know that I had heard him and needed to mull it over a while, or wait till he walked away, then go do something strangely special for him, like make his favorite dinner (or for us I would iron his shirts...he loves it when I do that cause he knows how much I hate it) Once I started doing that, he would come to me afterwards and tell me he was at fault for being angry and open the discussion of what was really bothering him. We started talking like we used to and making jokes about the craziness of it all and things started getting hashed out to the root of the problem.
I was shocked, but all of a sudden he is helping out around the house and with the baby, as well as making special time for me. I in turn have learned how to curb my nagging (I really like to and am really good at it) and to only get into it with him when it really matters, instead of fighting him on every little thing throughout the day. Once a week he gets a special dinner where I put the baby to bed first and do something outrageous for him for dinner. Last week I rented a movie and made his favorites, wings, potato skins and beer, (I added some green beans for myself)and we ate on the sofa like we used to.
Date night also helps as well as a weekend away to remember what it was to be a couple, instead of parents. Remember that that couple is the most important part of the relationship because without it there would be no kids.
It can get better. Everyone I have talked to has said that the early years of marriage (especially when you throw kids in the mix) are the hardest because it's all about setting up boundaries and learning how to argue as well as communicate. It can get better. Oh and the little one will show you a very noticeable change when the fighting stops. NO matter how much we try to sheild them they feel tension and know when something is not right. The whole house will feel lighter. Good Luck