Marriage and divorce

My husband threatens divorce every three weeks to a month. We have been married six and a half years and together almost seven. We immediately started trying to conceive and a year into our marriage we started trying IUI and IVf. Three years into our marriage my youngest sister’s son came to us and we obtained custody. The child is a teenager and came to us at age 11 1/2. He has always had problems such as rudeness, oppositional behavior, and anger issues. He is seeing a therapist. While my husband and I had problems before the kid came to live with us, we rarely argued and settled our differences with conversation and amicably. Not so after my nephew came. Every day was a battle with my nephew and eventually this would spill over between my husband and I. Almost every weekend has been miserable with arguments and accusations. My husband builds up anger and resentment towards my nephew and blows up. He has broken glasses, put a hole through a door and two and half months ago gave me an ultimatum to choose between him and the child. When I refused to choose because I thought it was incredibly juvenile and I will not abandon a child or our marriage, he told me we were getting a divorce. (Before coming to us my nephew was with another sister and her husband also gave her an ultimatum to choose between him and the kid and she chose her husband hence why my nephew is with us now.) I begged him to take me back. We started seeing a marriage counselor. This morning I gently talked with my husband about what I see as overbearing and controlling behavior directed towards my nephew in the aspect of religion. My husband did not appreciate my words and his anger built. He called me names but I thought we had closed the topic only come lunch time my husband exploded at my nephew that he was not dressed appropriately for eating at his table (he was wearing a sweatshirt, baseball cap and slacks) and to change into a button down. Soon after that he exploded at him for not performing a religious custom properly and told him off (my nephew did talk back and oppose), and I had enough so I said something, “Lord help my husband.”I didn’t meant to say help my husband a just the Lord part but anyway. My husband went upstairs and my nephew and I ate alone with our dog. On the way upstairs he turned around and told me that we were getting a divorce.
I told him I was fine with that.
But now I am at a loss. I do not want to be married to my husband anymore and at this point I am scared to death to have children with him seeing how he acts towards my nephew in regards to religion. However, I am a full time student and cannot support my kid, my dog, and get through school living where I live.
I have asked my husband to wait till the end of the next semester when I will have undergraduate status and it will be easier for me to provide.
1. What do y’all think of my request? Should I just say let’s get it over with?
2. If I say let’s get it over with and proceed does anyone have ideas how I can live, go to school and support my kid and put him through school etc?