AITA for telling my MIL that I cannot stand the way she talks to my wife?

I’m not sure if I’m an asshole here but I want to be sure. My parents passed away when I was very young so I don’t have any family left. I’ve grown up in foster care.<br><br>My wife grew up in a very religious household and is now not religious at all. She is not a people pleaser and also does not have any problems with standing up for herself. Her mother however is still into all that and wants my wife to follow in her footsteps. My MIL and my wife have always had a problematic relationship.<br><br>My wife and I got married last year and we decided not to move close to her family. Last weekend my MIL visited us without my wife’s approval. My wife wasn’t home when she arrived and she is very much aware of the fact that I don’t tolerate disrespect towards my wife. When my MIL arrived, I told her to respect my house and my “wife’s house.” She started to talk smack about my wife behind her back and I interrupted her and told her that if she was going to talk bad about my wife, one of us would have to leave and it wouldn’t be me.<br><br>My wife came home and they got into an argument about religion and my wife’s choices, whether or not she should get involved with the church, etc. My wife felt like my MIL had no right to talk to her about these things since she is an adult now. My wife can be very harsh with her words and she told my MIL that she cannot call her a sinner and that she does not care about her faith. My MIL started crying and this is where it got too much for me. My wife cannot stand people attacking her and she will always defend herself.<br><br>My MIL started saying that she raised her and that she would always be like a child to her, that she cannot talk to her like that, she is being very disrespectful, etc. That is when I said that my wife is not a kid and that she cannot talk to her like that. My MIL started yelling at me, saying that I was teaching my wife to be rude and that it was my fault that she was being disrespectful and rude to someone who was just trying to raise her properly. That is when I lost my temper and I told her that she cannot talk to my wife like that, that she was being very disrespectful and that I would not let her talk to my wife like that in my house. I also told her that she was my wife's mother but that she was also my wife and I would not stand for her talking to her like that and that I would always defend my wife from people who talk to her like that. My MIL cried even more and left.<br><br>My wife’s family is very upset and are saying that I should not be involved in their mother/daughter business. My wife and I are on the same page. AITA?