Ay is an okayish brick in a world where bricks are rare. He's strong, but is overshadowed by people like Tsunade and Sakura and only keeps up because of his speed. He doesn't bring anything to the table that isn't some form of chopping and smashing.
Demiurge is one of the top dogs in a world where bricks can smack around boss summon sized creatures like ping pong balls, and he's got damage negation, limb regrowing regeneration, entire armies worth of summons and oodles of esoteric magic on top of it, not the least of which is just straight up mind control by speaking.
This isn't a fight.