1) Believer 2) Worshiper 3) Worshipper 
• (n.) One addicted to theosophy.
The·os'o·phist noun One addicted to theosophy. « The theosophist is one who gives you a theory of God, or of the works of God, which has not reason, but an inspiration of his own, for its basis.» R. A. Vaughan. 
[n] - a believer in theosophy
theosophist A person who studies theosophy.
noun a believer in theosophy