I am a non-believer. You may, therefore, define me by whichever descriptor suits your worldview. I could be a naturalist, a materialist, an atheist, a secularist or any other term that allows my beliefs to be defined in relation to others who believe essentially the same thing. I will not be offended if you call me any of those things. I will be put off, however, if you decide that my non-belief makes me immoral.
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