“I have,” wrote Kant, “had to deny knowledge in order to make room for faith” What does that mean?

In what sense does Kant “deny knowledge” – and why? In what sense does he make room for faith—and what sort of fatih is this?
Update: PLEASE NO ANSWERS INVOLVING THE BIBLE OR PERSONAL EXPERIENCE, THIS IS A PHILOSOPHICAL QUESTION AND THUS NEEDS A PHILOSOPHICAL ANSWER!!!!!! THANKS!
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