Spirituality is primarily about human transformation in this life, not just salvation in a future realm. While Western Christianity lost much of this emphasis, and became rather practical and often superficial, the Eastern church taught theosis or divinization as the very real process of growing in union and likeness with God in this world.  This is one of the many losses Christianity experienced in the Great Schism of 1054, when the popes of East and West mutually excommunicated one another.
.. Pope John Paul II was acknowledging that the Western church had largely lost its foundational belief in divinization, and in the practical order had even denied its possibility. Instead, we were just “sinners in the hands of an angry God” and even “totally depraved.” No wonder humans suffer from such lack of self-esteem today. We haven’t told them the central and foundational Good News! I believe this is the source of a lot of the anger and disillusionment with Christianity today.