I am not one to use the word racist often. I usually use the word bigot. Hating someone because of their creed (any system, doctrine, or formula of religious belief, as of a denomination) is not racism since a creed is not a race, but it is bigotry.
I don't dislike Christians or Muslims, however I do dislike religion. I dislike when Christians try to impose their beliefs on others in my country, especially if they are imposing those beliefs in public schools, or other public life supported by taxpayers. I would also dislike if someone was doing the same with Islam, but they do not have the numbers to effectively impose their belief here, but Christians do have the numbers to influence public policy even if such behavior violates the US Constitution's Establishment Clause.