Haven't read through the thread so forgive me if this has already been mentioned. Faith can be thought of as a perspective. God's faith is His perspective. There is more to faith, but let's stick with that for this discussion.
Unfortunately, sometimes people cannot understand, or fully understand, something without a change in perspective. What did Morpheus say about the Matrix? No one can explain it to you, you have to see for yourself. Coming to an understanding through faith can be like that. You can hear some words and know they are true, and even understand some things, but at some point, you have to move into the thing itself to grasp the perspective.
Maybe this can break it down a bit more. If you believe, and I certainly do, that the spiritual world is real and that God is real, it is still very difficult to grasp certain spiritual things without changing your perspective, and by that, I mean experiencing them. When a person believes something, their perspective changes. In the spiritual arena, believing at least for some things can be thought of as spiritual travel. You have a spirit, and you believe with your heart, which your spirit is part of. So believing something spiritually relevant puts you into a different perspective within the spiritual world. You literally move into that place and experience with the rest of your being including your mind follows.
So if you want to understand the things of God, you basically cannot do so without faith because they are of such a nature that you need to see it for yourself to a degree and you cannot do that without exercising your faith and moving into that arena.
Hope that helps.