I do see this is fishy. There also the humans cult that seems like they did something to also cause this fight as well. Seems way to good. Also really feel they will turn his sister group as the enemy.
Thats the reason they want to wipe out all humans!? Trespassing!? that's quite the exaggerated response. They are basically the old man across the street who yells at kids to "Get of my lawn!". Also seems like the "gods" maybe trying to play the long game. Make humans worship them, they then get their own humans with super powers, than they attack the humans...again.
if they allow the gods to implement that, the monster could wreck havoc any time, the gods needs to bring some insurance that will allow the humans to keep them in check, that way it will truly be on equal terms if not it's just a plain trap