Jesus, especially in the Fourth Gospel promised resurrected eternal life to those who believed-on him and would follow him.
To typical Modern Man this promise seems much less than it was. And - so long as Modern Man continues to think and reason as Modern Men do - i.e. reductionist literalism - this misunderstanding is unavoidable.
The eternal life Jesus made possible for us is not merely a matter of 'living forever' - it is (also) a place, a condition, a different world - a state-of-being in-which we live-forever.
And eternal life is resurrection, not persistence.
Eternal life is attained only-and-necessarily via death. Death is the separation of the living spirit from the body - and the eternal life is a resurrection, by which the surviving spirit is given an eternal body.
Modern thinking is literal merely, hence necessarily false. But it is not because ancient thinking was 'symbolic' (like a poem) - because for Jesus 'eternal life' was literal-and-more.
Modern Man regards what he supposes Jesus to have promised to be both too-little, and impossible. Too little because - what's so great about about continuing to live? Since life is intrinsically interwoven with corruption, disease, decay and inevitable death: with 'entropy' - which rules this reality.
(i.e. All we experience of this life is inevitably spoiled by what Christians call sin).
Jesus's complex and simultaneously-multifaceted promise is reduced to a single thing; and that thing made literal in terms of being this reduced thing, and this only.
So Modern Man 'knows' that eternal life is neither possible (because of entropy/ sin) nor is it desirable - because (to the Modern sensibility, her-and-now in 2020) life is suffering - and gets worse the longer it continues.
Thus Modern Man supposes that Jesus was offering something he does not want; even if it were possible - which it isn't.
To escape this damning illusion requires that Modern Man thinks differently than Modern Men think. The primary sin lies in the Modern mode of thinking, which itself intrinsically frames all discourse (not just eternal life), reduces all concepts, and dis-values what Jesus actually said.
The actual gift of Jesus - as rendered in the unsurpassed poetic-prose of the 'King James' Bible - has been 'translated' into managerial bullet points of a bureaucratic discourse: and this 'executive summary' was regarded as the whole truth... and rejected on that basis.
The Modern rejection of Christianity is not, therefore, a matter of 'evidence' or 'facts'; it is a consequence of fundamentally incoherent thinking spilling-over into public discourse.
The rejection of Life Eternal is, indeed, a consequence of evil thinking.
The way Modern Man thinks is itself evil; he turns every-thing he thinks-about into evil: he trivialises, drains meaning, drains purpose and hope. His mode of thinking leads to value-inversion - consequently to fear, resentment, despair - and then (quite spontaneously) to active-embrace of the Satanic agenda.
As we see all around us... And this is found even among self-identified Christians; because mainstream Christians (nearly all) think exactly as typical Modern men.
What Modern Man needs (and I mean needs) to recognise - is that the way he thinks is a choice; a choice he has-made. And that choice was for evil.
Modern Man must (and I mean Must) repent his choice to think-reductionist-literalism: must repent, or surely die.
Note: After all, the word repentance can itself be understood as amounting to think-differently-about.