it is only right and proper to question things you do not understand, and where your quest for proof is a laudable one; however, fasting has rarely been subjected to any scientific scrutiny (in the absence of monetary gain) and in the absence of this, we have to rely on the trials and experiences of those who have gone before us.
The overwhelming documented evidence from qualified health-practitioners is that fasting is very successful in the recovery from disease, and where all other avenues of health-recovery have largely failed previously.
This is why alternatives exist and the reason Curezone exists at all: the failure of Mainstream Medicine in the cure of chronic disease, and especially so with their protocols in cancer treatment.
It appears that you have an argumentative nature.
Nature exists of course, and that anyone's conceptualization of God is subjective, but you should have understood the thrust of my message without resorting to being pedantic and flippant.
Unless you are here for the purpose of this forum (water-fasting-support) then you should realize that you do not belong.
Do some independent research on fasting and discover the benefits of fasting and detoxification for yourself, and then return where we may be able to have a more intelligible discussion.