Don't hold your breath. Sometimes parents just get in this rut that circles the thought: what have we done to deserve this? what could we have done differently to avoid this disappointment? why is my child hurting me like this?
You and I know how damn selfish it is for them to think these things, but believe you me, it comes up. Even with my very accepting mother, once or twice early on, it reared up. We got over it, I explained to her it was selfish on her part to bring MY mental/medical issue back to her, and she ended up getting that. But yeah, don't wait for spontaneous anything from them in a positive light, I'd say. If you take a breather for a while, then come back and make the effort to change their hearts and minds a bit more, then back off and regroup, then try again, rinse and repeat. Tough stuff, but prolly the only way. And if they are throwing bible quotes around, well, that might really be a lost cause.