Human Social Development ISN'T a deeply Existential Matter ... ???
Only for those whose God has failed them. If they have been indoctrinated into God dependence from childhood, they do not have the social resources to deal with the existential crisis of the loss of God when it is not their choice. Their church can only tell them to have faith in God Who cannot fail, when in fact He has failed miserably. They are left only with the fact of their existence and are forced to make sense of it. As Sartre wails in the title of his play there is NO EXIT! God is dead, the social support group still clinging to God is useless, and the atheist humanists were so far underground that there was no help there.
Fortunately that is changing. There is a critical mass of people comfortable with their atheism that those willing to reach out from their existential morass can get the human community support they so desperately need.
For others the existential crisis is unnecessary, as they move into and with a secular commuinity they no longer have to tolerate the dysfunctional relationship with God and can cut the dependency by choice.