How do all of you diplomatically handle talking to your conservative families?

I (40f) am chronically ill and cant seem to make progress with my condition, so I May have to move back to live with my family later this year. I have been an atheist for 10 years, but have not told my family. I moved out of the Bible belt to a more liberal state across the country 13 years ago and I have been much more comfortable living here. Even living in a red rural area, it doesnt feel anywhere near as conservative overall as the place I grew up. When I visit my family every year, I try to keep my mouth shut about my beliefs. I'm likely autistic and bad with conflict, to the point where trying to stand up for myself at work recently led to me having panic attacks from my manager's pushback and had to quit. Of course being exhausted from this illness also contributes to my inability to deal with stress. If I have to move back there, I feel like my best course of action will be to finally let them know I'm liberal, but not atheist. This gives me a basis for setting boundaries when talking about politics. For context, my family is the type that are totally ok with project 2025. They have never been abusive towards me, and I believe them to be well meaning, just deceived. Pretending to still be Christian is, I think, a decent compromise. It won't be difficult to bring up Jesus teachings to defend many of my beliefs. But the stress of listening to them spout dumbass conservative talking points has got to the point of making me feel actively suicidal when I visited over Christmas. If They know I'm liberal, it should cut down on some of it because they will be more self conscious. My mom in particular is conflict avoidant. My family isnt particularly contentious. If They make snarky comments, I can straight up tell them that I'm open to discussion, but snarky comments will make me leave the room. I'm interested in everyone's thoughts and advice on this course of action, as well as your own personal stories of how you have managed to diplomatically handle these situations, since cutting them off doesnt seem to be a viable solution for me.