I would call the church and express my displeasure.
I'd look for some counter protest to join, and if there was none I would approach our local pastor about it. I would be thinking of something along the lines of a quiet prayer vigil, rather than a rowdy protest.
There is another side to this that bothers me though. Christian Bibles are regularly burned, along with whole church buildings, in other parts of the world, and this does not garner national attention, or violent street protests. There is very little activism geared towards protecting and helping them, and certainly no front-page stories and presidential invovlement. This one looney with his congregation of 50 is an attention-seeker, and the attention he's gotten has fed his ego, just as the flag burning and "Death to Christians" protests have boosted his ideas that Islam is violent. I think it's shameful all the way around, and it's a never-ending cycle of violence and broken relationships that hurts my heart. I don't care what religion people are, there is no excuse for *any* of this behavior--book burning, flag burning, calls for violence.