Since the Christian churches are thoroughly corrupted and converged to totalitarianism, and Christian evangelism has proved all-but useless in The Modern West; our best hope perhaps lies in inculcating a desire for Heaven that may influence our post-mortal choices.
In other words, since (it seems) modern people place this-worldly socio-political issues above religion and spirituality (which are assumed to be a mixture of wishful thinking and institutional manipulations). And since this civilization has adopted a materialist set of metaphysical assumptions that renders life-beyond-death impossible: Modern Man expects or wants only a painless death followed by annihilation; or maybe hopes for some kind of transhumanist-scientific extension of this life.
Against this, there may be a few countervailing influences such as JRR Tolkien and CS Lewis's fantasies; which encourage, perhaps implant, at least a desire for something more; something beyond death: a daydream and yearning for Heaven in particular (however vague this notion in the mind of Modern Man).
This daydream/ desire/ yearning may be the best or only hope that post-mortal Men will at least consider accepting the gift of Jesus Christ.
Such is the importance of Christian fantasy in this age.