Some well made points as usual, Benjamin. What if the technoscientific overhaul is the antichrist that John portended? The problem is that you still try to apply logic and reason where there is none. Any Christian who tells you they know, clearly does not. Constantine kinda blew it for us in his way when he institutionalized Christianity. From there, we have to accept that the institution (Church) is flawed as just that, an institution. Thus, like man, it is imperfect since it is run by him\them. Measuring time in the human context would mean nothing to a supernatural deity who does not exist within time, or without it. The Eastern Orthodox way is that we acknowledge what we do know and equally do the same for what we do not. We are to use our rational minds for that which we can measure and understand but rely on our hearts for what we do not. I can't really speak for Western Christians as their practices are somewhat foreign to me in relation to Eastern Orthodoxy. If you really want the best answers, I think Mt. Athos would be the best source since the life they live there is the deepest exploration of the relationship between God, man and church in addition to be a mystical denial of all things that are of the "world". In conclusion, there is no real Christian existential crisis unless it is created by man and tongue-in-cheek here, we take the Borg code and twist it because "Existence is futile."
Plato said "Hope in man is sleep for those who are awake or better yet those who desire to be fooled."