Atheism and Ethics

[Angrboda]

I wasn't arguing that we necessarily would behave immorally, only that the reasons not to do so become purely utilitarian, in which case, behaving immorally is often the better choice.

Thanks for the clarification, that is useful
Even people who believe in objective morality can see behaving morally as the better choice depending on their preferences. Just get past that pesky conscience and you are away; or just live with a little bit of guilt until it is forgotten

Are you suggesting that people assess choices with moral implications based on utility rather than right and wrong? That doesn't seem sensible. Even if they take into account utility, they still have a reason to behave morally, even if they don't do so. The other does not which leads to purely situational ethics. (ETA: Btw, could come to the same conclusion and would come to the same conclusion are distinctly different thresholds.)