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I think it's particularly interesting that the cross wasn't used as a symbol of Christianity until the fourth century. I guess we should see fish in places other than the bumpers of our cars.
Also, if you're the sort of nutty impolite person that doesn't know why we call comments on a blog "threads" (i.e. that the comments have something to do with the original post) I wonder if you might take a moment to leave a completely unrelated message about your own internet sales site. Thanks!