Elce ‘Thunder’ Lauriston, an Adventist evangelist in Jamaica, left Adventism and gives his story here:
On Religious Hardtalk: Former Adventist, NCU Theology Student, Elce ‘Thunder’ Lauriston – 12 April 2016 [no longer online]
Reasons for his departure:
- Investigate Judgement
- Daniel and the papacy
- Sabbath in Genesis and the Old Testament
- Ellen White – distinctive Adventist doctrines discovered through Ellen White and then proof-texted into Scripture.
Not everything he says is Catholic, but one can’t expect an Adventist to leave Adventism and go directly to the fullness of the faith. Perhaps, with your prayers, and in time, he will.