Why was there a need for a global flood?

I doubt that. People talk about the flood bcause it's in the bible and some christians try to prove that it happened. If the story in the bible was "god snapped his fingers and all but Noah and his family fell dead" you'd still have christians talking about it and trying to find evidence for "the biblical finger snapping".

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soon I discovered that this rock thing was true
Jerry Lee Lewis was the devil
Jesus was an architect previous to his career as a prophet
All of a sudden i found myself in love with the world
And so there was only one thing I could do
Was ding a ding dang my dang along ling long - Jesus Built my Hotrod Ministry
Live every week like it's Shark Week! - Tracey Jordan
Just a monkey in a long line of kings. - Matthew Good
If "elitist" just means "not the dumbest motherfucker in the room", I'll be an elitist! - Get Your War On
*not an actual doctor