Can you think of any other ideology where there is a highly defamatory neologism for anyone who criticizes or insults people for following it? If you are labelled an "Islamophobe" you may lose your job, be socially outcast, or you may even face legal action as "Islamophobia" is often considered hate speech.
There's no Hinduphobia, Buddhophobia, or Christianophobia. Only Islamophobia.
There's antisemitism, but that usually describes someone who is prejudiced against people of a particular lineage, something which said people have no choice in and can't change, so it's justifiable to compare it to racism. Being Islamophobic is just disliking people for their ideas and views, something which everyone does all the time, accept for with Muslims, when it is considered immoral and even potentially illegal.