While there is some Christian-specific religious symbolism within the traditions of my sorority, it never bothered me as a non-Christian. Like others, I keep it in a historial context. I found the rituals to actually be much closer to ones I'm religiously familiar with as a Pagan.

There were times that I felt a bit out of sync with everyone, since Paganism wasn't as common a faith as it is these days... but all of my sisters respected me for my differences of beliefs (since I gave them the same respect back)
It would bother me if I had joined an organization and then, only after initiation, discovered that members were extremely strict about religious devotion. I'm sure this varies from chapter to chapter, depending on the region of the country.
~ Mel.