I agree with 33girl and ariesrising. As a non-Christian, I view references to Christianity as historical ones. It would bother me much more if my chapter was really into Christianity on a daily basis.
I have to admit that I am bothered by any situation where a belief in God is assumed to be "the default setting" though . . . for example, I would have never known that some fraternities insist that you believe in God in order to be initiated if it was not for GC -- and I doubt that that kind of thing comes up during rush. I feel for any kid who signs his bid card only to find out that in order to join the group he chose he either has to lie or convert
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I don't think we should be forced to change our rituals or anything else to accomodate people of all religious beliefs, but it would be nice if none of our members felt uncomfortable during ritual because of their religion or lack thereof.