Because faith comes by hearing. Are miracles, signs and wonders, and the power of God by the Holy Spirit still being taught in America's churches? We are a technological and skeptical nation. This has crept into the churches.
Jesus Himself could do no miracles when he came back to Nazareth because of their unbelief. How can we expect to do better than Him when there is little faith?
Too broad a brush. It shows how there are those who don’t believe in spite of seeing how many were healed. No one can reach that mindset, so they live in their misery.
There are many many who believe today but too many have unbelief. They know/believe God heals but ‘will he do it for me’ mindset.
Mark 9:23 “’If you can’?” said Jesus. “Everything is possible for him who believes.”
Mark 9:24 “Immediately the boy’s father exclaimed, “I do believe; help me overcome my unbelief!”