"Personally, I would
never express or imply to an atheist or any non-Christian religious
person, that they are delusional, lack critical thinking skills, etc."
You seem to imply that being delusional can apply either way, atheist or theist. Non sense. The more educated you are, the greater your critical thinking skills and the better the chance of your being non religious. The opposite is for the less educated. Religiosity and education run in opposite directions. Atheists quite frequently hold their position because they refuse to believe in things that can't be proven, therefore the term delusional is inappropriate. On the other hand, religious people, by definition, believe or have faith in the invisible, therefore they run a greater risk of being delusional.
Yes, Ray Franz was closer to being delusional than Bertrand Russell, but he was far from being an idiot. In the end, who gives a rip about being an atheist or theist. What matters is your humanity, of which Ray Franz had much more than most atheist and theists in the world.