Psst, Larry

There is no such thing as a former Seventh-day Adventist.  

I was going to offer that you might be a former Seventh-day Adventist Church member, but the church issues no such a certificate.  Nor is there a membership card you might ceremoniously burn.  And your baptismal certificate is irrevocable.  

There is no escaping Seventh-day Adventism, Larry.    

It is really hard even if you are dead, as denominational archivist David Trim confirms.  Impossible otherwise.