Huh!? There are people who act on good faith and do good in every sect. That has nothing to do with being delusional.
calling faith a delusion, are of course part of our right to free speech, but are disrespectful and intolerant towards all those fine christian men I know.
What about non-Christian men and women? Say polytheist versions of Hinduism and just about every mainstream version of Christianity are incompatible, thus at least one group of faithful is delusional. I don't think thinking someone is delusional is necessarily disrespectful, and it is certainly not intolerant. *Lunatic*, n. One whose delusions are out of fashion.
Delusional is today perceived as an insult. Calling an opponent, someone with other views or believes, deluded, is today perceived as an insult. You just have to join Colman outside, where he's gone to test my statement and is just getting a beating from a deluded drunkard :) Free at last! Free at last! Thank God Almighty, we are free at last! (Martin Luther King)