A world view that seems to be increasing in popularity, particularly among contemporary libertarian-leaning secularists, is Stoicism.
That Stoicism says much that is important and true seems obvious to me, and reading people like Epictetus or Aurelius is probably well worth many people’s time.
Christianity says much that Stoicism says. For examples, focusing on what is the ‘good life’, cultivating inner peace, practicing non-attachment towards ‘things’ (i.e., skepticism about materialism or hedonism), self-discipline, letting go of anger or negative emotions, and so on.
In a way, Stoicism is a tradition which captures much of Christian practices, without invoking the figure of Jesus of Nazareth (and so making tendentious historical claims) or bringing in the theological or creedal add-ons that organized Christianity tends to focus on.
It is obvious why, if someone is living in what is basically an existential vacuum of post-Christian thought, such a tradition might be found to have potentially significant value.