"But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned." 1 Corinthians 2.14
There are only two types of human beings: the natural and the supernatural. The natural man/woman do not receive the things of God because their nature is earthly, natural and Adamic. Therefore, their faith is also natural.
But the supernatural man/woman obey the Word of the Spirit of God because their nature is heavenly, spiritual and supernatural. Therefore, their faith is supernatural.