Leaving an alcoholic husband?

I'm wondering when and how is the best way to leave an alcoholic husband. I've been with him for 7 years and married almost 4. He drank heavily at the beginning of the relationship and I left him because of it but he later stopped (or so I thought) and we got back together. It wasn't until after we were married that I realized he had continued drinking behind my back. Throughout our marriage he has continued to drink, hiding bottles of alcohol all over the house. He took a second job and has been using his cash tip money to buy alcohol which he later hides or drinks thinking I won't find out. I have told him many times that I will leave if he continues and does not get help. When he's drunk he tells me it's not a big deal and he doesn't care but when he's sober he always promises to get help. He seems to be drinking less now but I don't trust him at all since I've seen this behavior before and he was just hiding it better. He is very verbally abusive when he is drinking and he did physically assault me ONCE. I also know that he drives drunk but I know that if I put him in jail I will be unable to support myself. I want to leave him but the problem is that my family is very religious and they do not support divorce for any reason. They made it very clear to me that I need to work on my relationship and they will not help me if I choose to leave. I do not make enough money at my job to leave and I live in an area where there is a very high unemployment rate. I've been looking for a better job for six months and have found nothing. I do have two degrees but this has not helped my job hunt. I don't know what to do...