What does Montag do to convince Faber that he needs to care about things again?

Answer :

In order to show that Faber has to start to care for things again, Montag had to tear pages out of the bible.

Why did Montag tear the bible?

This was out of the fact that he needed faber to act like he expected him to. He was of the opinion that Faber has become a coward.

In order to get him out of his cowardice, he starts to tear the bible. It was during the act that Faber finally yielded.

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