All faith is eminently debunkable. It is just that in some cases it is possible to debunk it with facts, and in others the facts are unavailable.
The Book of Revelations says that in the final days 'the stars will fall from the Heavens'.
Well, no, they won't. Maybe it could LOOK that way, but we know for a fact that Betelgeuse, Vega and Polaris are not going to fall from the sky into Earth.
This is because we know that they are (1) very, very far away, thousands of light years away, actually, and (2) they are headed AWAY from us, and (3) if any of the stars or other heavenly object that we can see in the night sky were to fall to Earth, that would be the end of Planet Earth. A second object would merely whiz through the cloud of rubble that once was Earth. A plural shower of stars is an impossibility.
Of course, a METEOR shower is possible, but as we know, meteors are not stars.
So we can prove that faith in that sentence of the Book of Revelations is simply bunk. This diminishes the credulity that any sane person would have in the rest of that Book of what appears to be mostly nonsense.