In this context, a clergyman noting the bibilical prohibition against homosexuality, could be prosecuted for a "hate crime."
Saying homosexuality is immoral is certainly not punishable, or if it ever did become a crime, it would immediately be struck down as unconstitutional.
Despite my opposition to hate crime legislation
per se, I do think that encouraging people (like a pastor in his congegration) to commit crimes based on race, sex, etc. is a very big problem. And in the event that a crime is commited as a result of such encouragement, the pastror could be regarded as an accomplice.