People know that I like calling people "idiot". But, I don't do it all the time. It has more effect when I use it in certain times, rather than all the time. But, I feel people are idiots or say idiotic things all the time. But I don't use the word or variations of it all the time. I use it when I know it'll have an effect.
People who call people "delusional" on here, without thought to do so, really has no effect. Mainly because a good percentage of people on here use it all the time. Therefore, it becomes meaningless.
To your first point: while those things may be true, for the most part, billions of people think that way. All those people, in regard to the other definitions that most people recognize rather than the one I provide, think of those things when you call them "delusional", and a good portion of them, I feel, do not represent such definition.
I wouldn't label them as anything. As I mention to Hatter23 above, I sometimes refer to people as an "idiot" but I don't do it all the time, I use it when it has an effect. And, usually it's based on what they say or do rather than what they believe.
It doesn't matter whether it's true or, not, what matters is the effect. The effect they see based on atheists calling them that, and based on the effect for the one using it.
The only effect I see is, from their point-of-view: everything they tell me about atheists are true. Now, maybe saying that to a person who is already questioning their beliefs may have an effect: but to those who don't? I don't believe it does.
Your last line of your comment, I feel, proves my point. People want there to be something else after death. They want to be reunited with their loved ones. This is not delusional, this is false hope.
Only at the point, I feel, the discussion with the person has escalated to the point where pointing out the delusion or idiocy would be warranted. Not before.
You think the vast majority of people in the world need treatment and medication? That, in itself, seems delusional. Most are religious because they were born into it: i.e. brainwashed. Being of said state-of-mind doesn't make them delusional, it makes them ignorant of reality based on said premise. Ignorance is not the same as delusional.
When you have educational systems teaching things that others have shown to not be true, you're now debating against those educational systems.
I know there's more to it, that's why I said "basic definition". It's the one definition that the dictionaries I looked up agreed upon, and therefore why I used it, and not all the others.
I agree with both your points.