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This post originally published in March of '09. I have added links to similar posts.
Its been quite interesting to see how many atheists there are who believe that objective morality exists. Actually, I would say that the majority believe in objective morality. However, objective morality is inconsistent with the atheist worldview; they don't have a foundation for acting in a "moral" way versus an "immoral" way. I'm not saying that atheists can't be moral; they can. I'm just saying that they can't justify it. Here's why.
Morality implies "oughtness". How something ought to behave. That implies that you understand that that thing (that ought to behave in a certain way) was designed to behave in the expected way. Example: A watch ought to keep time. It is designed to keep time; therefore, it ought to. If it were not designed to do anything, it ought (is expected) to do nothing.