Islamophobia
Islamophobia (not to be confused with Muslimophobia) is an irrational fear of Islam and Islamic culture. It is often used to demonize ex-Muslims and critics of Islam, essentially labelling them as racists.
Example 1:

Person A: All ex-muslims have Islamophobia.
Person B (Kafir): I don't think so, but you know I recently left Islam.
Person A: You Islamophobic asshole, I hope you burn in hell forever. I hate you and your kind, you were never truly a Muslim, Allah will curse you and your family.
Person B(Kafir): What the? You are a Kafirophobe.

Example 2:

Person A (Critic of Islam): I'm studying Islam to write a critical essay about it's flaws.
Person B: Do you have Islamophobia? Why do you hate Islam and Muslims so much?
Person A: I'm not Islamophobic, but you are definitely an idiot.