Over the past several centuries there has been a rapid Christian apostasy, rejection of the reality of the spiritual, and in general secularization - starting in Western Europe but now spread over the world.
Behind this lies a perceived conflict between "science" and religion - which conflict presents itself in a manner that is simple and fallacious - simple because it affects so many people, of so many types, in so many places and cultures.
Yet fallacious; because secularization has by-now also destroyed the basis of truth which was the basis of science; such that what now calls-itself science is merely a careerist bureaucracy serving the interests of its paymasters.
Perhaps the key fallacy is the misinterpretation and overgeneralization of an overwhelmingly convincing observation: the observation that 'modern' science is able to do far more than was possible in the past.
From this is correctly inferred that people in the past were often wrong about specific matters of science; but from this comes the general and false inference that therefore people 'nowadays' know-better than people in the past.
(This overturned the centuries-old opposite assumption that the past was wiser than the present, and that the world was getting worse.)
The observation of an objective improvement in scientific (and therefore technical) ability was correct - but the inference of modern superiority was false; because it was generalized from science to metaphysics - and metaphysics includes the assumptions that underpin science.
In other words; the present came to assume that the past was wrong - not only in the specifics of science, but in the generalities of metaphysics.
For example, because many past scientific beliefs were wrong (or, at least inferior to the present), 'therefore' past basic assumptions were also regarded incorrect: assumptions such as the reality of a personal God who was creator; that (therefore) we live in a created reality; that there is a spiritual beyond the material; that Men have a soul - as well as a body; that the soul survives death.
All these, and many other, basic metaphysical assumptions from the past were rejected as a package - along with the scientific specifics of the past.
This has been a disaster first for Western civilization, then the world; because in reality, science emerged-from Christian metaphysics - and (it turns-out) cannot survive without it.
Indeed, it turns out that nothing Good can survive without that rejected metaphysics - including the concept of Good itself; which has now been subverted into a relativistic relabeling of evil; while 'Christian truth' has been (and is increasingly) inverted into mandatory demonic lies.
Even worse; one who yields to the deadly fallacy, enters into error by what is almost a one-way door leading towards more and greater error.
In other words; one a personal and individually-loving God has been erroneously rejected (as 'unscientific') then there is neither basis nor reason for 'truth' - and so this error is no self-correcting.
This deadly fallacy was not inevitable - Men could have chosen otherwise; although clearly it has been a temptation too strong for most people to resist.
But now we - as a civilization, as a mass majority - are deep into this error; and working from their own existing assumptions, people are helpless to correct it.
To correct this deadly fallacy requires going back to discover and re-examine basic metaphysical assumptions; and that is something anybody can do - but extremely few people are willing to do.