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Modern public culture, and the majority of the intellectual ruling elite, have a total disbelief in miracles.
They will deploy all possible resources to argue-down any possible miracle, especially of course the miracles of Christ; from a basis that miracles are impossible, all phenomena have scientific explanations, and therefore any naturalistic explanation is infinitely more plausible than a miracle.
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In other words, miracles are implicitly being taken as sufficient proof of divinity - especially the God of Christianity (and since God is supposed to have been proven not to exist, then neither can miracles).
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This leaves modern culture wide-open to utter deception by anyone who can credibly prove a miracle. Such a person will be assumed to be a divine messenger, or even a divinity.
The 'miracle' may or may not be real, it may be real or a cunning simulation; but if it can be proven such as to convince enough people, then whoever practised it will be worshipped as a god - since that is the covert assumption behind the utter refusal to regard miracles as real.
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Others who are vulnerable to deception by miracles (real, or indistinguishable from real) are Christians who disbelieve in 'unseen warfare'. This includes many who are prone to regard 'religion' as intrinsically 'good' and spiritual experience as intrinsically true, valid and divine in origin.
Even Charles Williams - a truly great theologian in many respects, whose work I study intensely - did not really believe in purposive evil, in 'the devil' (or found difficulty in doing so).
And this opened-him to the potential evils of magical practice (the quest for supernatural power; in his case poetic power) - at least to some extent and at some points in his life because he lacked sufficient awareness of the possibilities, the likelihood, of demonic deception.
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So, we need a proper understanding of miracles. On the one hand, miracles are real and possible; on the other hand, even real miracles are not necessarily derived from the divine indeed in a time of hedonism, aspostasy and corruption then deceptive (evil tending) miracles (whether supernatural or cunningly faked) are most likely.
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