Ignicolist–
From the OED:
“A fire-worshipper.
1816 T. MAURICE Ruins Babylon II. 43 In whatever region of the earth this infatuated race of ignicolists took up their abode, the sacred fire immediately began to burn. 1859 R. F. BURTON Centr. Afr. in Jrnl. Geog. Soc. XXIX. 340 The ancient Persians were ignicolists, adoring etherial fire.”
Famous ignicolists include:
–Serial arsonist John Orr
Biblioklept 