There's a difference between anti-Semitism and a rejection of Judaism, just like Islamophobia is not synonymous with rejecting Islam.

In other words, Huckleberry Finn portrays an ignorant and racist approach to people based on an accident of birth and not any character trait, but a rejection of religious doctrines with which one disagrees is a perfectly valid sentiment because it rejects beliefs and ideas at odds with one's own, ideas that can be accepted or rejected freely. Anti-Semitic statements of an ethnic nature would be on a par with your example, as would anti-Arab statements. However, I think treating a believer's conscious rejection and admonition of non-believers the same as base racism makes an Orwellian parallel.