The inherent sacrilege that taints your soul sometimes crowds out lesser banes.
Benefit You gain a +2 trait bonus on saving throws against curses and magical effects that produce curses.
Paizo didn't say this but since they created a curse descriptor, why not use it? For example, just say:
Benefit You gain a +2 trait bonus on saving throws against spells and effects that have the [curse] descriptor.
Seems cleaner to us and uses mechanics they've already created! :)