If we accept that all scripture is revelation from God (2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness

then we must accept that it is not God's will for anyone to be sick based on what's written in 3 John 2 Beloved, I wish above all things that thou mayest prosper and be in health, even as thy soul prospereth.
Doctors, contrary to popular belief, don't cure. They treat, remove, repair. The body heals itself. It's the way it's designed (if you will). My theory when it comes to Jesus healing is that what he did is manipulated the bodies cells to accelerate (maybe at light speed) to bring about what to some would appear to be a miracle. No laws of nature were broken.
As for common sense. Yeah, not everyone has it but then not everyone is endowed with wisdom either. One can obtain both from reading the scriptures without the need to believe in God/s.
I'm not sure you have a firm grasp on the article (on Slavery). Or perhaps I don't. Care to elaborate on why you don't think it's
claims are factual?