I have no respect for my parents' religion.
Why don't you have respect for their religion?
I disagree with some of the things they are doing.
It's not uncommon at all for people to find themselves questioning or leaving the faith of their parents. It's good for the family relationship if you can at least respect that they believe. But if you can't, and they're doing hurtful, toxic things, it's understandable to need to remove yourself from that situation entirely.
I'm aware of that, but I don't want to respect what is clearly stupid and wrong.
You don't have to respect religion, but you should at least respect your parents enough to let them believe in whatever they want. They are free to do so after all.