Sounds to me like your mom has a temper problem, it also seems as though she is controlling. And to take your money even though you are an adult is called theft. Richie she can't do these things, it is illegal but thats only if you want to do something about it.
My advice to you is start looking in your paper for roommates wanted, you should be able to rent a room form someone pretty easy. Tell your mom you are moving out, tell her how evil she has become and that you don't like that in a person especially your mother as she is to be caring and understanding towards her children.
The cult can control your mom but it should not be allowed to control you. If you allow her to do these things then she will run with it and all those kingdumb hall elders will help her control you. Get away from this garbage and you will live an awesome life. You can finish school if your living on your own. I figure this is your last year in school anyways and it's almost over. If there is one piece of advice I can give you son is stand up for yourself in what you believe and don't believe. Life will be good to you if you let it....God Bless....Merrill