First, he’s not a “Christian”, big or otherwise, if involved in Eastern Orthodoxy. Looking at his actions from that perspective might help you make more sense of the situation. Liberals are anti-Christian and they aren’t controlled by Christ.
I guess I’d start praying for him to have a true come-to-Jesus moment as a good place to start.
Then try tough love and change your mindset to be thankful for the 800-mile distance as a protection from him poisoning the mind of YOUR young teenager. It’s your job to direct her; not his.
He may change his thinking some day. He knows what’s true and right down deep inside. Until then, he’s toxic to the family unit.
My opinion and I may be completely wrong.
Excuse me, care to elaborate?