Even Jesus couldnt do many miracles where the people had no faith. you do not believe in signs and wonders, you will probably see none. However once the falling away takes place and the true remnant rises up, and begins to produce fruit after their own kind, then they who do know their God will do exploits.
Jesus perform miracles to prove he was the Son of God.
Jesus did not just heal the sick and raise the dead for the express purpose of taking suffering away, but to produce the credentials of his kingdom. Yet he did have compassion on the people and felt their suffering enough to relieve them by showing his concern through love.
In Matthew 8:10,13 Jesus healed a centurion servant without even being present. He healed by touch and from a distance demonstrating that He is Lord of space and time.
The Pharisees objected saying He was speaking blasphemies “only God can forgive sins" (Mt.9:6), and they were right. To dispense a legal pardon could only be done through a sacrifice and from God. To show that He, as the Son of man, had authority and that He was God, He healed the man of his palsy. He healed what they could see, proving He was able to forgive His sins that they couldn’t see.
The whole point to Jesus performing the miracles was to non believers so they would know he is the ONE, the big cheese!
That is why the gifts were passed on to the apostles. It was PHYSICAL PROOF BEFORE THE WRITTEN BIBLE WAS COMPLETED.