To me it reads like a "Letter of Termination" from a corporate HR office.
Fanatical religious people can't think clearly. I remember many years ago someone was putting their personal rubbish in my business dumpster. I decided to go through it and see who it belonged to. In the rubbish was a letter from a devout Pentecostal deacon to his son. The deacon had written a similar letter to his son as the one that you received. His son had decided that he didn't want to be a Pentecostal anymore and the father was playing the same distancing game as your parents. The only difference was that the father knew his son was going to burn in HELL. We love our parents (well mostly) but we can't live our lives for them any more once we grow up. I feel bad for you but you have a wonderful nuclear family of your own that deserves all of your love and devotion. Best wishes.