Anyway, I guess it depends on ones definition of fringe.
I'm against animal abuse but, fortunately for anyone within viewing range, I'm not stripping down on the sidewalk to protest it. That seems like a fringe activity and, because of that, I think PETA is a fringe group.
You, being an athiest, are against Jesus displays at government buildings. I don't think you're going to rip them down when you walk by but I'm not sure any of these athiest organizations are doing that either. That would be "fringe", IMO Seems like they migh write a nasty letter to someone though. I could probably equate that arguing with swampy on the internet about the War on Christmas. If you agree, would you consider yourself a fringe athiest?