God did not have to sacrifice his only Beloved Son to die on the Cross as Jesus the Man from Nazareth to give us healing and prosperity. But God had to do that in order to remove all of our sins and reconcile us to Him.
But have we taken lightly the forgiveness of sins by giving more value and worth to healing and prosperity?
Abraham, Jacob and Solomon prospered before the Cross. Naaman and even Pharaoh [who took Sarah] were healed before the Cross.
A sinner regenerated to receive free pardon by Jesus the Christ is the biggest miracle. That is the power of the Gospel. It is even more miraculous than raising the physically dead and all miracles put together!