I understood him, and I see his point. He is being influenced by his strong emotions, so I can understand why he didn't establish the points in-between points.
Great Britain has an official State Religion. Christians also make up the majority of the population. Their legislation can be strongly influenced by religious fundamentalists, which is the basis of laws that restrict personal liberty, i.e.; Mind & Pain numbing drugs and Euthanasia.
His Uncle had to endure more suffering than humanity would allow for dogs, because Faith-Heads believe in souls and eternal damnation.
To say that there exists an omnipotent & omnibenevolent god is contradictory, as he experienced first hand. For a Faith-Head to throw some brainwash-jargon at him is adding insult to injury. Either their god does not exist or their god is a prick that is unworthy of praise.
I don't really think he'll do bodily harm to any individual; he's just blowing off steam in a psychologically healthy way…by writing an angry letter.
The Hippocratic Oath is to do no harm. If the patient's death is unavoidable, then comfort and an individuals will to dignity trumps all other obligations.
I've been a warrior for most of my life. I'm a teacher now, but I still fantasize that my end will come on my feet and fighting. If I can not be so lucky as to die in combat, then I would like to punch my own ticket through honorable suicide, as opposed to some drawn-out and painful death (taking care not to leave any sort of mess for someone else to clean up).
My views on death are reflected in my views on life. Death is nothing to fear, because it is nothing. Something trumps nothing, so long as it is a pleasant something. When this something has been guaranteed to become full of despair until nothing is reached, then I'll happily declare my stop, and jump off life's trolley.
I live in the United States, where it is illegal to commit suicide or obtain medicinal euthanasia. This imposes upon liberty like no other legislation, by declaring ownership of life.
Suicide and Drug prohibitions are drawn directly from religious law. He is angry with organized religion for its hand in his suffering, and his uncle's suffering. He is angry with Faith-Heads for giving power to organized religion.
He does not believe in the god that the Faith-Heads uphold as a reason for the laws that caused this suffering, and he is therefore justified to say that "THIS" particular god does not exist because it is contradictory in nature.