He has been what is called by Mormons an "Inactive" for about a decade, meaning he does not attend church or more importantly no longer pays tithing. However unlike other religions if you wish to leave Mormonism, you have to send a request to SLC (Salt Lake City) and have your name stricken from the records (or Rolls as they are refered to), otherwise you are still counted in LDS propoganda as an official member of "The fasted growing church in the world" and your name may be used to back up church policy, propaganda and doctrine, with implied consent.
If you do resign, you receive an official notice from the church informing you that, in effect, you are going to Hell, that you baptism has been rendered invalid and that if you at any point want rejoin the church, you will have to request to do so, serve a probationary period and then be rebaptised if you are found worthy.
This is what Mr. Green and his family have done, such is their disgust with the SCC (So called Church)'s recent behaviour, with regard to "Sinners".