I think you're looking for the gospel song Who Do You Say That I Am by David Parks. Unfortunately, there's little information on the song, and there isn't even a video up on YouTube! It might be worth checking Amazon or iTunes, though.
Lyrics to Who Do You Say That I Am by David Parks
You turn water to wine, And they call you magician. You give sight to the blind, And they call you magician.
What about you, what about you? Who do you say that I am? Who do you say is the son of man? Do people see, what you believe? Who do you say that I am?