Your statement asked "can the natural man can believe on Christ", and you answered "no". This verse does not say the natural man cannot believe.But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
1 Corinthians 2:14 KJV
Right, but the issue is that you claimed those miracles are meant to show inability. My question is how? The blind man was able, by hearing. Which is how the bible says faith comes. And thats what Jesus told the blind man, your faith has saved you. No inability whatsoever.Ok so I didn't explain myself. It's a picture, that's all. Of course there are deaf and blind people that God has saved on Calvary in Christ.