When we talk about beliefs, worldviews, epistemological positions, etc, we are not only discussing what is. We are human beings, not robots. In most or all of us human beings, there is a sense, an instinct, telling us that we should find the truth and that we should put our trust in it, live in accordance with it, and if necessary occasionally push back against alternatives that we deem to be not true, especially if we deem the consequences of following such an alternative view to be highly detrimental to our living in accordance with what we believe to be true. Such a desire often becomes mangled, lost, forgotten and/or neglected in the course of our lifetimes so that we become more interested in satisfying our lusts and desires, whether they be for power, sex, good feelings, etc, but in general I don't think it starts out like that.
Even if that is not the case for most or all humans, let me say here that it has always been the case for me (and I attribute that to God's grace alone), and I believe such is true of most of my friends, so that makes at least a few. And I believe it is true of many or even most of the interlocutors on this blog, whether atheist, agnostic, liberal, Romanist, whatever - there is something in us that wants to know what is true. And there is an ineffable, existential instinct (for lack of a better term) that drives us, tells us we should stick with it, and even that we should move our lives toward further verification of that truth we hold to. And if we find it to be wrong upon closer examination, we should drop-kick it, perhaps with regret, perhaps without, and change our position to hold to the new discovery.
We have seen time and again on this blog that the atheist worldview has no objective, overarching grounds for any moral position. Sure, atheism has room for a personal code of morality, it allows for a societal morality to evolve, it has room even perhaps for a categorical imperative or something similar. But ask enough "why?"s and we discover not that the emperor has no clothes, but that the chariot is in fact empty. Everyone is their own emperor and therefore there is no emperor at all.
What implications does that have for the aforementioned motivation for our believing this or that worldview? Implied in "I believe in ____" is the statement "And I recommend it to you b/c I believe it to be true", whether or not the person making the statement wants to admit it. It boils down to "I think you also should believe this". On atheism, however, whence comes the power of this should statement? Out of thin air! Out of the chemical processes, brain gas, firings of neurons and axons, of the brain, and everyone's brain fires just a little bit differently. There is no should, there merely IS. So why should I believe in atheism? I neither should nor shouldn't. Why shouldn't I believe in Jesus Christ as the only way, truth, and life, the only way to reach eternal life and bliss? I neither should nor shouldn't. Why should I reject something if it has no evidence in its favor, as atheism says is true of Christianity? I neither should nor shouldn't.
So, since it's all the same one way or the other, I'll go with what you think is a grand illusion. And if atheism is true, the moral value of such a blindfolded position is the exact same as the "enlightened, empirical, rational" position - that of atheism. Think it makes a difference, to a bunch of people who will be dead in less than 100 years, whose identity, children, accomplishments, and "nice" deeds will be forgotten in the ultimate fondue pot of the Earth when the Sun goes into red-giant stage, to say nothing of the heat death of the universe? Think again.
There probably are no duties. Now stop worrying and enjoy your life!
Many Atheists are Hypocrites about Morality