avid, zealous (adj)

marked by active interest and enthusiasm

"an avid sports fan"

zealous (Adjective)

Full of zeal; ardent, fervent; exhibiting enthusiasm or strong passion.

Zealous

The Zealots were a political movement in 1st-century Second Temple Judaism which sought to incite the people of Judea Province to rebel against the Roman Empire and expel it from the Holy Land by force of arms, most notably during the First Jewish–Roman War (66–70). Zealotry was the term used by Josephus for a "fourth sect" or "fourth Jewish philosophy" during this period.