One does not need to have religious faith to believe in the dignity of human beings, and that an unborn child fits in that category.
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Actually it is impossible to believe in the dignity of anything if you reject the concept of dignity. By denying absolute truth there is no ground for holding one opinion above another. Dignity, then, for a moral relativist, has no more value than indignity.
Yes, and it's impossible to believe in the evolution of things, if you reject the concept of evolution. You see how circular your argument looks?
Mr. Merriam and Mr. Webster put it thusly: "the quality or state of being worthy, honored, or esteemed". No mention of a supreme being in there. I can esteem the life of an animal, more so if it is my pet (that I would spend money to save the life of), less so if it is my food (that I would desire be killed with a minimum of suffering).
Same's true of persons, I can deem an unborn human being worthy, because of it's innocence, and I can deem a capital criminal unworthy because of his guilt.