Personally, I don't take issue with Christians having a prayer rally and excluding other religions voices in the belief that Christianity is the true religion; Islam and other religions believe the same and try to convert others. That is our constitutional right.
What bothers me is who is funding the event, the American Family Association. I don't think the Southern Poverty Law Center hurls the tag "hate group" around if someone sneezes wrong. These people can be vicious in their pursuit of their so called truth. Just recently in New York, they and the Counsel for Marriage harassed us residents with automated phone calls day and night polling the question of whether we agreed that marriage should only be between a man and woman. If you said no, they called back and again and again, I believe so it was so someone would change their vote to see if the calls would stop. How Christian is harassment?