I think in today's world, spiritual death would be called depression.
That is lack in the ability to enjoy life and all it has to offer.
As far as considering it a religious condition, many people understand that what goes on in *faith* based institutions is not fact, it is what people choose to believe. Faith/belief. Perhaps, they are angry at the people who they consider lied to them.
For some people, there is place for religion/faith in their lives, for others, not so much.
Uncovering the meaning of one's life often is a lifelong search! Religion is prepackaged answers, and very suitable for many people.
One of the great benefits of Christianity is that there is room for all kinds of beliefs and healthy practices if one chooses that road.
There are no happy endings.