Wow. This sounds like a nasty problem.
I found it interesting that you said you know you're going to hell. I want to encourage you to keep reading the Bible and you'll find more things than you ever thought could fir between those two covers. I would suggest starting with matthew, mark, luke, or john, though. They're easier to understand than the old testament and are great to start with.
The advice I have about your mother in law has already been given: try not to argue. Arguing only makes things worse. I would also suggest reading chapter 31 of the book of proverbs where a woman describes a good wife. Keep in mind the virtues she describes, not so much the chores and work. This was written a long time ago when a hard-working woman did a lot around the house. Today, a hard working woman has the option of being hard working at home or in a job.