I believe Noah is not a metaphor but real. The flood was to destroy the hybrid people. Noah was not a hybrid. It may be a question of what were the Nephilim. Perhaps they were angels. Perhaps they were demons. Perhaps angels are demons. Some suggest demons are the children of the daughters of Eve and the sons of God being the angels. Perhaps demons are half human and half angel and therefore it is hard to say if they go to Hell, Heaven, Limbo or what. Perhaps the Nephilim were giants. Some say there are giants or lizard people hiding many miles under the planet.