Joyfulnanna -- it seems like your parents have absolutely no respect for you. Maybe they never have. Sounds like you've been trying for years to explain why things aren't conducive to a healthy relationship with them.
This is a common theme with EAC. We don't feel like we were ever respected/valued or listened to... Because we were not and continued to not be even when we reached adult age.
So this goes deep, throughout your whole life? They undermined you, tried to control you etc. To a certain degree that is the nature of humans. and It's not an unreasonable thing to think about, it doesn't have to be abusive. and By defininition, parents make some choices for their children, they guide, mentor, impose their own thoughts and views on their children, as part of the child's cultural upbringing.
I agree with all of those things. It's not so black and white where abuse is concerned. Someone being more 'in control' in a relationship of equal adults can be healthy. It can also be dysfunctional/abusive depending on the situation.
There is a huge difference between a healthy power imbalance and unhealthy. I think most EAC would agree that a huge reason for estrangement is that parents want to continue the "normal" power imbalance of an adult over a minor child, into their child's adulthood/past when it's appropriate.
When the AC finally reaches their limit on "listening to mommy because she always knows best" and start to want the same autonomy? Then We get called disrespectful or immature and are clearly being 'controlled' by some 'outside influencer'.
Also, as for the cultural/religious aspects of things, I have mixed feelings around that. How the parent handles if their AC prefers to follow a 'different path' says everything about the health of the relationship. But that's a whole different thread/topic itself.