A cult is any small religion. Often pagan religions, the remnants of genocided indigenous religions, and many religions descended from the golden dawn. Oh, and it's also that thing Jesus had up until Rome declared it their state religion. And personally, I like the religion of Jesus a lot more than Post Roman Christianity.
If we're talking about abusive religions, there's absolutely no difference between one rapist's religion and an international religious organisation of rape apologism like the Church. There's no reason you need a different word to describe the two. They're both abusive religions.