Islamophobia goes beyond the description of irrationnal fear or hatred for Islam. Just like antisemitism is more than the hate or fear of semites or homophobia or transphobia are more than the fear of homosexual or trans people.
All those terms (islamophobia included) are used by researchers to describe systems of oppression against certain people.
So, when we talk about Islamophobia, we don't talk about religion, we talk about the systemic oppression that face muslims in the west and in countries like China.