 If you liked
Chrno Crusade
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 ...then you might like
Tatakau Shisho: The Book of Bantorra
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Chrno Crusade is a religious organization that fight against demons, only one of them helps the protagonist.
Tatakau Shisho (contrast of Chrno Crusade) is an organization created by a certain God. These people with different magic abylities fight against a religious group that define life in a different way that use human as weapons.
Both anime have action, slice of romance (Chrno Crusade more evidence), guns, mystery...