IIRC, Schlieiermacher is the guy responsible for boiling Christianity as a religion down to two concepts: The universal fatherhood of God and the universal brotherhood of man. This gross misunderstanding is still readily evident today in the social gospel and Christian pop psychology being preached from so many pulpits.
Kant is a perfect example of a person who is highly intelligent and discerning, and yet can neither see nor discern the things of God.