I believe that the symbols through-which people used to relate to Christian reality have all-but lost their power; but, whether or not you agree, the public and shared world of symbols has now been taken-over - trivialized, subverted and inverted - by the totalitarian mainstream of government, media and institutions.
If we are not to life consciously futile lives - then we need to know life as deeper than the mundane surfaces with which we are bombarded 24/7.
The depth of life goes "deeper" than perceptions and emotional responses; because it entails knowing (believing) that there is purpose to life - which which knowing there is purpose to "the universe", to "reality".
And, of course, this purpose must be something we regard as Good, to which we personally which to affiliate our best efforts.
But beyond purpose - if the depth of life is to be robust to its ills - we also need to know that we (ourselves) will continue eternally beyond death.
If not for this personal and everlasting life; then the evils and entropy of the world will - sooner or later - destroy everything we value: everything that gives present life its purpose. We will get sick and ill and die; so will those we love; and all that we most value in our societies and communities and nature itself will change, degenerate, dissolve...
We therefore need a purpose which we personally endorse and that extends into forever.
Such is the basis that may underpin a solid sense of depth in life.