The biggest part of the ministry of Jesus was healing all manners of sickness and diseases and don't forget Matthew 8:16 to 17 just for starters. Just because you have unbelief or little faith when it comes to healing doesn't mean others cannot have faith to receive what belongs to them in Christ, including sinners, which is all part of the Gospel of the Kingdom of God and not the so-called gospel of man. God has Good News for those who are sick in the same way that He has Good News for those who are lost. Unbelieving believers cannot receive what belongs to them but only believing believers. I myself am a believing believer and not an unbelieving believer or even a doubting believer or wavering believer. Shalom.