You see, the problem is that you would have to show me an ethical atheist. And to do that you would first have to define ethical and good apart from religion. And when there is no superior being who ordered the universe and decrees what the outcomes should be, you have no basis to say that any given outcome is superior to any other.
If actions A, B, and C lead to outcomes X, Y, and Z respectively, the very best you can hope to do is say, “I, personally, and this is only my opinion, prefer outcome X. So the best course of action to achieve it is action A.” You have no basis for saying that another person is wrong because they would prefer outcome Y. You have no basis to say X is “better” than Y. “Morality,” and “ethics” become completely subjective. You can say that society S has determined that it wants to achieve outcome Z, and so it has determined that action C is good, (at bringing about outcome Z, not good in any absolute sense.) And now the fact that any athiest might happen to agree with that society and promote action C doesn’t prove that he is good. He just agrees. What he is is a “good citizen” of that society. It’s completely subjective and relative only to that society. Another society might decree his actions “bad” because they adhere to outcome Y. There is no absolute good from that perspective.
The reason that only religions can make a claim of absolute objective goodness is that a supreme being who created the universe is the only one who has the absolute authority to say, “I created this universe for purpose X, therefore action A is good. Actions B and C are not.” I’m not saying that their claims are right. I’m saying that only in that case can you make any objective value judgements about outcomes X, Y and Z. Athiests can not be capital E Ethical, they can only adhere to the standards around them. And therefore, the existence of an ethical, “adheres to the standards around him,” athiest proves nothing.
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Why do you dismiss a single person’s goals and his prescribed actions to achieve those goals as unworthy consideration for agreement on propriety?
You ascribe “absolute authority” to a religious creator figure, but simply deny that validity that people may feel their own, rationally arrived at conclusions about purpose and conduct has, and the power that may hold over a society.
In fact, your non-atheist is also only adhering to the standards around him, unless you can show that he knows those standards without learning them from other people and his society.