35 Jesus heard that they had cast him out; and when He had found him, He said to him, “Do you believe in the Son of God?”
36 He answered and said, “Who is He, Lord, that I may believe in Him?”
37 And Jesus said to him, “You have both seen Him and it is He who is talking with you.”
38 Then he said, “Lord, I believe!” And he worshiped Him.
The man was an outcast from His religion, but saved by faith.
Son of God (v. 35) — Son of Man in most early manuscripts. It is the title of Jesus as Messiah. Jesus was asking him if he believed the very thing that had just gotten him thrown out of the synagogue. Jesus goes on (v. 39) to speak of His role as a judge. A role for which Son of Man is also used (John 5:27).
Jesus again states His deity (v. 37).
Only to the Samaritan woman had Christ previoiusly so clearly stated His deity. She was, as was the blind man, outside the synagogue. The nation rejected Him, only those on the outside received the truth.