[tokai]

The clinical definition of delusion includes social consensus. From DSM-5:

"Delusions are deemed bizarre if they are clearly implausible and not understandable to same-culture peers and do not derive from ordinary life experiences. […] The distinction between a delusion and a strongly held idea is sometimes difficult to make and depends in part on the degree of conviction with which the belief is held despite clear or reasonable contradictory evidence regarding its veracity."

[Animats]

That's an escape hatch for religion.

[jl6]

I always wondered if there was a clinical basis for that escape hatch or if the drafting committee felt it was just too contentious to go there.

[Animats]

Probably the latter. Homosexuality was removed from the DSM as a diagnosis in 1973, by a vote of 5,854 to 3,810. Gender identity disorder was removed from the DSM in 2017.