Litany of Righteousness says "If the target is evil, it takes double damage from attacks made by creatures with a good aura." It's on the Inquisitor spell list...but the inquisitor still needs a way to get the aura.
Holy Weapon says "This power makes the weapon good-aligned" and the Smiting Judgment says " At 6th level, the inquisitor’s weapons also count as one alignment type (chaotic, evil, good, or lawful) for the purpose of bypassing damage reduction."
Both of these talk about the weapon's aura not the creature's. Does that count for double damage?
If not, what are some other ways (e.g. spells or items) for an inquisitor to gain a Good aura?