In addition to destroying the cross on top of the church in the first stage of Lousiana, there's something else that will bring the wrath of the divine down on Rayne.

First, trash everything inside the church. Break all the pews and anything else you can get your blades on. Also, perform a jumping slash and destroy the crucifix at the back of the room. Eventually, there should be a loud crash and the entire church will shake.

It's also interesting to note that you can attack Mynce here and she will pursue you relentlessly unless you can manage to jump somewhere too high for her to reach you at.