A permanent transforms into a non-Human creature if it transforms and is a creature without the creature type Human after transforming, regardless of whether it was a Human creature (or a creature at all) before it transformed. For example, Westvale Abbey and Thraben Gargoyle will both cause Cult of the Waxing Moon’s ability to trigger when they transform.

A non-Human creature that’s put onto the battlefield transformed, such as Skin Shedder, will not cause Cult of the Waxing Moon’s ability to trigger.