Christian faith is not a system. It cannot be portrayed as a complete, finished intellectual construction. It is a path, and it is characteristic of a path that it only becomes recognizable if you enter on it and start following it.
They [religions] do not save people, so to speak, as closed systems and through faithfulness to the system; rather, they bring redemption only when they bring men to the point of "asking after God" (as the Old Testament puts it), "seeking His face", "seeking the Kingdom of God and His righteousness".
~Pope Benedict XVI "The Truth of Christianity?"