It is not false confidence in themselves. After all, if their enemies were so great, they wouldn't be hiding and scheming like cowards. They wouldn't be using a weak pantheon to waste their time.
Instead of throwing them a piece of meat to preoccupy them, those gods would have confronted them and fought them openly if they were strong enough. But history has proven that they are not strong enough.
Many gods have confronted them openly and regretted it quickly. So they are not concerned too much about the scheme against them. They are even already planning on what to do after they win the war against the Thames kingdom.
They plan to go to the Western Divine Domain to fulfill the quest they got from Kutneri. Apparently, Oceania used to be an ancient god in the Western Domain. If they are to find any trace of her, then it will be there.
-----War Is Coming