this org was originally started by Mennonites who are Christians. They accept all people regardless of religion into their healthsharing group. You have to believe in G-d of the Bible, helping your fellow man, living a healthy lifestyle and praying regularly. They are substantially cheaper than regular medical insurance. You can google them on the internet.
According to what you are writing it sounds alright, as long as believing in the G-d of the bible includes the old testament.