Step 1: Understand the term.
A "fanatic" refers to a person who is extremely passionate or enthusiastic about something, often in a way that is extreme or excessive. When it comes to religion, a fanatic is someone with narrow or extreme views.
Step 2: Eliminate the other options.
- A "satirist" uses humor, irony, or ridicule to criticize or mock people, typically in a social or political context, not necessarily related to narrow religious views.
- An "optimist" is someone who expects positive outcomes and does not reflect narrow or extreme religious views.
- A "feminist" advocates for women's rights and gender equality, which is not related to narrow religious views.
Step 3: Conclusion.
Thus, the correct answer is "Fanatic."
Final Answer: \[ \boxed{\text{Fanatic is the correct answer.}} \]