What caused the Flood?

All we know about God, if anything, is from the Incarnation story, preserved by the Church, and its impact on Paul above all, before the much later gospels.

God incarnated in to Jewish culture. A distinctive, ancient culture with a phenomenal number of divers yet more ancient cultural influences. At the crossroads of the world, the pivot of thousands of years.

Which naturally has nothing whatsoever to do with God. Because the God we see through a glass darkly in Christ, for the first time, is still golden head in the clouds above His Jewish feet of clay.

God as He is, is not the monster of the OT. Or even the NT inseparable from it, except by transcendence. He’s perfect.