The claim of the Bible is that it is the word of the living God, written by human penmen, to the inhabitants of earth. How can we know that this claim of the Bible is true?
“How excellent is thy lovingkindness, O God! Therefore the children of men put their trust under the shadow of thy wings.” Psalms 36:7 ~ If you believe that Divine Power created us, then you can and must believe that same power can make us whole. If God made the earth, the seas, the stars, and each intricate particle of living creatures, then how much more simple for Him to cure illness, if He wills it?