Church of the Final Testing
The Church of the Final Testing has a simple principle at its core:
Destruction Day was God bringing everyone to the same level so that the worthy might rise to the top.
In order to join the Church, a member must have passed an initial trial. Destruction Day is that initial trial for everyone over the age of 2. But then after that, a member can only rise through the ranks to eventually reach the rank of Worthy by passing through a series of ever more difficult trials unassisted.
The church has some trials which it administers, but other stages can only be passed through real world examples, different for every individual. The reverend of each individual branch of the church determines what trials qualify.