It's a childish, shallow, and transient understanding of life.
The poet W.B. Yeats captured it well. Atheists are stuck here:
That is no country for old men. The young
In one another's arms, birds in the trees--
Those dying generations -- at their song,
The salmon-falls, the mackerel-crowded seas,
Fish, flesh, or fowl, commend all summer long
Whatever is begotten, born, and dies.
Caught in that sensual music all neglect
Monuments of unageing intellect.
The spiritually sensate are here:
O sages standing in God's holy fire
As in the gold mosaic of a wall,
Come from the holy fire, perne in a gyre,
And be the singing-masters of my soul.
Consume my heart away; sick with desire
And fastened to a dying animal
It knows not what it is; and gather me
Into the artifice of eternity.