[Tagging] religion=multi* ?

[althio althio]

> that is not a problem, as "multi" doesn't exclude "all", but "all" requires "all"

Indeed, it is not a problem, it is a solution ! :)
Use two values for slightly different concepts.
multi == multifaith == multiconfessional == various == value1;value2;...
all == non-denominational == nondenominational == all_religions ==
every_religion

Anyway I hope that Andy aka SomeoneElse <lists at atownsend.org.uk> can
give us his feedback.