God isn't purifying or glorifying His church through afflictions. He isn't testing His children's faith.
Sicknesses are due to the failure of being taught about the body of Christ as we have been taught about the blood of Christ. Christians are suffering from sicknesses and diseases that Jesus, as our substitute, has already borne for us, Matthew 8:17 . . .that it might be fulfilled which was spoken by Isaiah the prophet, saying: “He Himself took our infirmities and bore our sicknesses.”