So if religious people are deluded, can we then class faith as a mental illness? Will we institutionalize people of faith until they are cured? Will we re-educate them–for their own good? Do the undeluded atheists get to say when they are fully cured?
Or are religious people just less intelligent? All those millions of people for the past several thousand years, some quite amazingly intelligent and insightful–none are as naturally smart and clear-seeing as the average modern atheist. Thus should not the atheists run the world, and tell the faithful what to do (die off)? The faithful, not being very intelligent, might be lower on the scale of humanity, and from there we can classify them as sub-human, and then it is only for their own good that we get rid of them or make them a sub-class–for their own good, of course.
Sweepingly classifying an entire segment of humanity as ‘stupid,’ or ‘deluded,’ so that you can safely ignore whatever they say without giving any thought to it, is quite dangerous in the long run, for anyone at all. Feeling nicely superior is very pleasant, but it’s not very safe. Even for clear-sighted atheists.
Now, extreme scenarios aside (albeit ones that have actually happened in the past 30 years, let’s remember), ‘deluded’ people, in general, are not stable or good leaders. Their delusions come out in their lives, so that they have problems, or become reclusive, or can’t hold a family together, or become too controlling, or whatnot. In extreme cases they may be charismatic leaders, but their communities self-destruct. OTOH, we have the majority of ordinary religious folks, who are frequently good family and community people, and some of whom have been great leaders, artists, or writers–who have built long-lasting, valuable things.
Just like any other idea, when humanity gets involved, religion can become an excuse for tyranny and evil, and can provide fodder for the mentally ill to build delusions upon. That is not a problem of God, it is a problem of the fact that we are human. Sometimes we get sick and often we are very good at being rotten to each other.