What you are saying is the standard Christian view that "Without god everything is permitted".
And even more... since atheists consider themselves rational then that means they are only following their rationality to its logical conclusion by becoming immoral psychopaths.
...What I'm saying is that, unless I believe that there are objective moral norms, it seems to me that ideal rationality requires that I maximize my utility by rejecting all (subjective) moral norms and reasoning purely based on prudence.
... I still think that an ideally rational being, convinced that morality consists of nothing but subjective opinions, would encourage others to believe in objective morality while considering himself bound by no moral norms at all....
But if I recognize that morality is subjective, then it seems to me that it is in my interest to adopt the laxest morality possible. In this way, I would maximize utility.
But I have to say that, were I really to believe that morality is nothing but subjective opinion, I would feel less bound to behave according to moral norms.
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