Actually, the Bible never said that faith came from hearing the word of God. It said that faith comes from hearing, period. And since it is a truth that we humans will have faith in whatever it is that we hear, it is imperative that we make sure it is the word of God that we study and absorb.
Someone who has no intention of ever wanting to study or hear the word of God, is not suddenly and magically going to develop faith in God because we spout verses at them that they deny and don't want to hear. This belief that the "words" have some magical properties, just because someone's ear drums are vibrated by the modulation frequency of speaking them is the very basis of the Bibliolatry so many Christians get hung-up on.