Except they are... The land needs them to prosper. He** they have miracles through faith. The saintess has powers because of her bloodline. Sure they are wimpy but they are technicaly gods. Plus they are not the worst gods i have seen in fiction.
There are no miracles. The Danans are born from concepts, and as ancient beings, they can influence those concepts. Erin Danua, the Dannan of Justice, can influence the rollout of justice and can win against any odds as long as the party she is defending is just. Tatez Balthazar is the opposite. He can fuel his concept with his own thirst for vengance and can further enhance it theough the others' thirst for vengance. The land doesn't need them to prosper. They have been technically non-existent for thousands of years at this point, and the land is moving on without them. True, their power do help with many things, but the world does not "need" them at all. If anything, the world is better off without them and their nemeses,the Demons. The skirmishes between Dannans and Demons caused much destruction during the post-Titan era before the Giodel War. If you don't know the lore, don't say things that contradict it.