There is a group of truly agnostic AA meetings in my area.
AA was initially welcoming but delisted them from their meetings directory 3 years ago, apparently making them much harder to find.
So "AAA" sued AA under the Human Rights Act claiming that they were discriminated against on the basis of creed. AA's defence was, get this, that they were exempt as a religious group who could restrict participation to the faithful.
A court did not decide on the merits of whether AA is a religious group as a settlement was mediated, but in the end AAA is listed again.