^Yes god did say that but synthesized drugs are as far from natural as you can get and the bible doesn't mention that
You see, when you synthesize a drug, you are taking it away from it's natural form and most companies do this for patent reasons and the problem with this is that the body has no defences to this and sees the synthesized drug as an attack on itself so most drugs have to be potent enough to knock that part of the defence system hard enough so that it can't fight it.
Nothing natural about most cures.
That said, I do not agree to trying to use faith to cure illnesses, diseases or aflictions as the reality of it is that it doesn't work and this is very easy for one to prove.