It all depends upon how it is presented. If I scream in someone's face, and wave the bible about in a condescending manner; I'm pretty sure it's going to be offensive.
watch the video, it was filmed by an independant film maker, not one of the Christians
BTTT
I did, and I agree that the Christians were well behaved, polite and rational. No question there.
However, there is a time and a place for Christianity; and walking with a bull horn through a gay event neither glorifies Christ, mimicks his behavior, presents a positive image to other christians, nor exhibits anything remotely religious. This was an 'In your face' assault on the gay lifestyle that was not remotely in line with the lessons Christ taught.
From the logical point of view, if a small group is given police protection to disrupt a planned meeting of a large group here, then it must be allowed everywhere. I personally do not want the police to force my church group to permit a Gay parade during our Easter Sunrise service. I don't want to struggle to hear my pastor (priest, Bishop, insert your religious authority figure here) because some Gay man with a megaphone is blasting blasphemous chants in my ears.