Establishing objective morality in an open-ended way without regard to confirming one's own religious biases, is not that difficult a task. As Sam Harris has said in his book The Moral Landscape, one merely has to acknowledge that in the evaluation of human behaviors as "right" or "wrong," we must undoubtedly refer to conscious entities—that is, anything that is sentient and has sensory experience. That we categorize human behavior in our interaction with fellow humans and even animals demonstrates our concern for their well-being. Now we have two axiomatic criteria—conscious creatures and well-being—which establishes objective morality. How do those things establish its objectivity? Well, because well-being is not a matter of personal opinion or preference. Imagine, for instance, the worst possibly misery for everyone. This is by definition "bad;" there is nothing conceivably worse since the term captures it. Surely there are right and wrong ways to avoid said misery, and surely there are better, more efficient methods of avoiding it than others. Such a task is an empirical one; that is to say, it will depend upon evidence about states of the world and of our brains. Thus science, broadly construed, is a pragmatic tool in the pursuit of answering these questions. Religion, by contrast, seeks to double-down on conviction and confirmation bias. Supposedly religiously-epistemic tools like "faith" lead only to credulity. If faith is a trust that is imparted onto someone or something giving the believer the feeling of truth, sans evidence, this can and has been applied to virtually anything for which the believer feels affirmed. Nearly all religions and their faithful operate as though they have arrived at moral and supernatural truths and most all of them use "faith" to get to that deep-seated conviction, but it is impossible for all of them to be simultaneously true, given their incompatibilities. Thus, faith has to be jettisoned in favor of epistemic tools like reason and evidence which promote skeptical inquiry and a sounder path toward moral objectivity.
