So much to say in response to this, where to start.
It sounds like your mom may, possibly, have a mental disorder. I don't know for sure, obviously, but it's possible. Or perhaps she is just a mean person by nature. Someone would have to diagnose her to decide for sure.
If she does have a mental illness it would explain some of her behavior and she would likely not have the control or ability to recognize her actions. Even just being a Christian doesn't change that.
Also, she may call herself a Christian, but that doesn't mean she is one. I'm a guy, but i could walk around telling everyone i'm a woman, but at the end of the day i'm still a male. Using a title on yourself doesn't mean anything. Especially if that title is 'Christian' when nothing about your life or attitude reflects it. She is obviously ignorant (or not mentally capable) of understanding what this truly means.
Guess what. If a parent catches you breaking the rules it's not 'judging you' when you get in trouble for it. It's called being a parent. It's called discipline (even if she is doing it wrong), it's called consequence for your actions.
It's evident you have been hearing a secular concept of judging, not the biblical ideal. What the bible Really teaches on judging is that Christians are not to judge non-Christians. But we Are to judge (in light of scripture) other Christians. We are supposed to call each other out, in love. And, even Paul, who wrote most of the New Testament, teaches casting people out of the church for continuing in willful sin. Meaning to judge them.
The bible also teaches we are to 'honor our father and mother'. If you are going around 'correcting' your mother regularly that's not honoring. This isn't to say a child should never have a voice, but more to the point of it should not be something that happens on a regular basis. Nor should it be done in a disrespectful or rude manner.
I get that your mother is a mean person to you. I'm actually not trying to make her behavior sound ok. It's not and she is very wrong in the way she acts, according to how you describe it.
Unfortunately a lot of bad people, especially bad parents, like to hide behind religion to make themselves look good in public and act differently in private. I've known a number of people who do this. Sadly there isn't much you can really do about it. The best thing i know to tell kids in your situation is just keep quiet, don't do things that might cause trouble, do your best to honor God in ALL your actions (such as not skipping school) and stay low until you are old enough to move out and get away from this treatment once and for all.
Perhaps you just worded it wrong but you said 'i know it's acceptable to God' when talking about your anger. It is not acceptable to God. If our anger controls us it is a sin. It's not a sin to get angry, but it is a sin when we lash out in anger or let our anger control us. Or when we hang onto our anger.
