What is an adiaphora in Christianity? They are ceremonies or rites which are neither commanded nor forbidden in God's Word, with a good intention to promote good order and propriety, or for discipline.
When someone makes an adiaphora no more an adiaphora but a dogma, an item by which a Christian is judged as being bad for not complying, then you got a cult in the making.
In Solid Declaration of the Formula of Concord, it urges the Christian to resists such imposition of an adiaphora as dogma. You can see this in Chapter X in relation to the Romanists/ Papist as the context of this imposition.
Is someone imposing something to you which is an adiaphora? You need to fight it, rather than yield to it.