or

"In the sociology of religion a sect is generally a small religious or political group that has broken off from a larger group, for example from a large, well-established religious group, like a denomination, usually due to a dispute about doctrinal matters. "

Works for me, whether you want to consider it a sub-group of Christian denominations or of the Abrahamic  religious complex (Christians/Jews/Muslims and assorted hangers on).

And faith is a delusion. I missed the point when speaking truth became intolerance: you want to be deluded, feel free.

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.}