Zealot

ˈzɛlət

noun

a person who is fanatical and uncompromising in pursuit of their religious, political, or other ideals

The word 'zealot' originated from a Jewish sect that was known for its strict adherence to religious laws and its violent resistance to Roman rule in the first century AD. The term has since evolved to describe anyone who is passionately devoted to a cause.

Oh, my Jesus Savior!” She rocked his head; he stared at her with the blank, shiny eyes of the zealot.

Stephen King

The Gunslinger (The Dark Tower, Book 1)

To Lucas, the religious zealot, the cooperative commonwealth was the New Jerusalem, the kingdom of Heaven, which is “within you.” To the other, Socialism was simply a necessary step toward a far-distant goal, a step to be tolerated with impatience.

Upton Sinclair

The Jungle

The character of the person called Paul, according to the accounts given of him, has in it a great deal of violence and fanaticism; he had persecuted with as much heat as he preached afterwards; the stroke he had received had changed his thinking, without altering his constitution; and either as a Jew or a Christian he was the same zealot.

Thomas Paine

The Age of Reason

Feisal was announced with Maulud el Mukhlus, the Arab zealot of Tekrit, who, for rampant nationalism, had been twice degraded in the Turkish Army, and had spent an exile of two years in Nejd as a secretary with ibn Rashid.

T. E. Lawrence

Seven Pillars of Wisdom