Yes, Kant explicitly says "I found it necessary to limit knowledge in order to make room for faith." Maybe I'm mistaken here, or giving him too much credit, but I never quite took him at his literal word here, as if he were saying "I set out to defend faith and realized that to do so, I'd have to limit knowledge" -- rather I take the Critique of Pure Reason to be primarily a project of laying an epistemological groundwork for the kind of knowledge embodied in Newton's Principia (that and arguing with Hume).