The Flaw of Atheism

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If that's the case there's no need for the book.

But he says he learns new valuable information whenever he reads it. He can read a verse he's read 50 times before and he finds a new, deeper meaning to it.

Of course people of other faiths experience much the same thing when they read and re-read their holy books. I doubt your father would attribute their experiences to their religions being true.

In fact, such an experience of ever-deepening meaningfulness is not confined to religous texts. You can get the same experience reading great works of philosophy or literature. I guarantee that if you read King Lear several times at different stages of your life, you will find new, deeper meanings in it as you yourself grow and bring wider and deeper experiences to bear on the text.

Needless to say, that's not the prompting of the Holy Spirit. It's you and what you bring to the table.