The Global Flood IS a possibility.
No, actually, it's not.
In fact, if we follow your logic back, then if creation is wrong, evolution
must be right. But the flood model present in your version of creationism is completely bonkers. Where would the water go to or come from? How could they possibly store enough food for all the animals, particularly those with highly specified diets? How did the plant life survive underwater for a year (and if it didn't, how did the earth refoliate)? How did salt-water and fresh-water fish both survive the deluge? How did the numerous parasitic, species-dependent pathogens survive - did Noah and his family carry
every human disease? Remember, "a miracle happened" is not a viable answer - we're examining scientific models of reality, and if you have to say "a miracle happened", you have conceded that what you are proposing is
impossible in reality.
Meanwhile, the best naturalistic explanation for life not based on evolution... Do you want just
any possible explanation, or one that actually fits the data we have? Because if you want the latter, then I'm sorry, but it's going to be some variation on the theory of evolution, because somehow we have to work in the facts we observe - facts like a universally shared genetic code, the concordance in the nested heirarchies of morphology, genetics, embryology, virology, and more, and the fact that we reproduce with variations. No matter what comes out at the end, it's going to look like evolution, because evolution is what we observe! It's like asking me to create a new model for physics, but exclude the calculation of F=M*A. Well, okay... P=R*B (Phorz = Rass * Bacceleration)? What do you want from me,
this is what we observe in nature! This is the case in all science - no matter what model is proposed to explain the facts we have, it
needs to explain the facts we have! Evolution does that beautifully, and any replacement for evolution will end up looking an awful lot like evolution 2.0.