When he said we need two things for salvation in which hearing is one of them, I don't want to believe he meant using the ears to hear because if that's the case, the deaf won't have salvation.

Hearing simply means the eagerness to hear the word of God which includes hearing by any means.

But do we really need a preacher? I believe that with the third element which is the word of God, we could attain salvation by simply reading the word of God and heeding what God wants to help us attain salvation .

Besides, the Bible says that we are saved by simply believing that Jesus is the son of God and staying away from evil.

I believe him when he says that many people lack knowledge and understanding. Even the Bible says that my people perish for lack of knowledge so if you do not have that knowledge and do not have the understanding supplied by God, then salvation could be far from u.