Very true, and I certainly believe in the power of prayer for the sick..........seen it work many times. But for one to say that God does not EVER use a Doctor to heal someone is just plain silly............The Holy Spirit imparts gifts as He will, and "healing" is one of those gifts...........
“But the manifestation of the Spirit is given to each one for the profit of all: for to one is given the word of wisdom through the Spirit, to another the word of knowledge through the same Spirit, to another faith by the same Spirit, to another gifts of healings by the same Spirit, to another the working of miracles, to another prophecy, to another discerning of spirits, to another different kinds of tongues, to another the interpretation of tongues. But one and the same Spirit works all these things, distributing to each one individually as He wills.” (1 Corinthians 12:7-11)
Throughout Scripture we see where God uses different peoples to accomplish His will here on earth........to flatly exclude Doctors from this is so very ignorant.........goodness..........
Anyway, you are correct........many are not healed because they do not have the faith to ask for healing, and to seek healing. Anointing, laying on of hands, and praying over is surely one way to receive both physical AND spiritual healing...........but one can also seek Medical treatment and still be in keeping with God's Word and Will...........well, that may just be me......so.....