Maybe even a part of him like spit could heal. Remember the woman who merely touched his garment and was healed?
It's called a point of contact. If God can make a man from the dust of the ground, how much more can he make this possible?
Surely the Son of God could cure that man's blindness with a single thought, why go through the Copperfield routine?
In the same way I could ask, why did God choose to make the heavens and earth in six days when he could have made it with a single thought. People think six days is short, this is all relative Brian. Deary me...such doubt. Sometimes Jesus would say such things as "get up and walk". But why do you question such things? These aren't surely your reasons for unbelief?
Some people say they would need to see God or a miracle in order to believe, parlour tricks etc. And some people require a sign when they need it not, obviously I'll count you as
not one of these people.
Clearly, you are now never going to say hypocritically that you would need God to do something for you to believe, for isn't the healing more important oh crafty ones?