“That’s just ad hominem name calling, not an argument.”
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Nope, no name calling at all. You got a correct and concise fact; “Darwin Christians” and “Gay Christian” have equal status - they’re both oxymorons. Like “Atheist Christian” or “Rapist Christian” - you can come up with as many prefixes as to try to feel less guilty about wrongdoing, but it doesn’t change the reality.