A "change of heart" is exactly what's needed. Anger, not God, likely has more to do with Christopher Hitchens' health and prognosis for recovery. (Yes cancer is curable, but not by poisoning and irradiating the body; there are options apart from chemo that doctors never mention).
There are many cures in fact. Stop feeding cancer, even accidentally, and the body often gets better on its own. If it has gone further, alternatives to waging "war" on the body are numerous and inexpensive. Because cures are not profitable and patentable, like drug cocktails with corrosive side effects, they are not taken seriously or discussed by mainstream outlets.
Cancer, Snakebites Need Not be Fatal
Thus have I heard. On one occasion the Blessed One was living near Savatthi... At that time in Savatthi a certain monk had died after being bitten by a deadly snake. Soon many monks approached the Buddha....and spoke thus to the Blessed One: "Venerable Sir, a certain monk at Savatthi has died after being bitten by a snake." "Assuredly, monks," the Buddha replied, "that monk has not suffused with thoughts of loving-kindness (metta) the four royal tribes of snakes. Had he done so, that monk would not have died of snakebite!" Full text