It's not even what's being said, but how it's being said, in my opinion. If someone starts talking AT me about anything, I quit listening and I often get irritated. The irritation often passes unless it happens one too many times, at which point, I'll either say something (and I'd hope I'd be polite about it), or simply leave. If it's ONLY me being annoyed, I'll probably just leave.

With regard to thread creep, if there's a well-worn rut about, the discussion almost inevitably falls into it. New folks don't know it's an old rut, and the rut may be a natural progression from specific to generic. Anywho, I don't mind religious songs, they're part of who a person is and I wouldn't want anybody hiding a perfectly normal part of their personality ONLY because someone might get offended. Be who you are as long as you accept me for who I am. THAT'S where I draw the line - when someone thinks I ought to believe something different than I do and thinks they can bring about this change by annoying me.