The Stumbler,
Your replies to your father are very well composed, stripped of emotion and backed by iron-clad logic. I can only see one flaw; forgive me for nit-picking, but if corrected, it's ammo taken out of a potential response.
Your 0.001% number is incorrect. It should be either 0.001 of global population, or 0.1% of global population. 0.001% of global population puts JW membership at about 7,500. (See you are wrong, what else is wrong in your logic, you are an angry unrepentant apostate twisting facts to make your point).
Best of luck in waking up your dad! Your efforts, as frustrating as they may be, are nothing short of noble.
EDIT: And please don't start me on illustrations. If I hear one more time the "..not drinking, but injecting alcohol in your veins" analogy related to blood, I may just do that on a massive scale and be done with it once and for all...