Why Satan doesn’t expose our “lack of signs” following the Gospel.
The Bible says, “These signs will follow them that believe.” And yet here is a Church holding this faith and unfollowed by these signs. The ready conclusion from this fact certainly is that the Bible is not true; and we might have expected that this argument would be much used by those who deny the Bible to be a divine revelation. But it has not been much urged; and why? The subtle enemy of man [Satan] saw that there was more danger to his own kingdom from the use of this weapon than advantage; it might have led to a result very different from that of disproving the divine authority of the Bible.
There is another conclusion to which it might have led, and that is a lack of faith in the Church. And thus the pressing of this argument might have awakened the Church to a sense of her true condition; and this Satan fears more than the Bible, knowing that a church asleep is the most powerful weapon against the world, much more powerful than any infidel arguments.
(Brazen Serpent, Thomas Erskine, 1788-1870)