I don't see the need to add a theology discussion (and the last option could have been different!).
He seem that the humans have been on different stages of development along they story on this planet. We could see this discussion as if one of this stages was wet or not: I mean after they can be described as forming part of the human family... and before us.
I say stages of development because he don't seem to me that the one that was carving stones (?) had the same kind of live or physical adaptations than us today... but we could still have some of this adaptations left!
Is notable that the first traces of social behavior is on close relation to the east shore of South Africa and developing along the same coast before start to move inland. The camps had fire and the base of the alimentation was sea harvested/fished/hunted at some level.
Is as well a fact that life for humans means in most of the cases water in abundance... if not look at a map of the human population in any point of his written or fossil history.
On my opinion is enough space for a wet stage, with out start to argue about how important has been this stage on our current form.
More personally: I believe on evolution of the species at periods of strong development when competitively facing expanding new resources (You can see an notable explosion of the feline populations and species when south america joined north america., the fossil record is well documented on this point).
The same way I expect an ape population adapt to new resources on a wet environment if they come by... like any other specie. As a diver I would like to believe about the aquatic ape theory, but we seem to be missing data to get a definitive conclusion: is a nice theory though... and I feel good to believe about.
Creation is another matter... the definition say: "The act of creating or causing to exist". I see theology discussing the status of existence himself. But because creation doesn't exclude evolution, and somehow we are here, our thirst of knowledge about ourselves is more than welcomed to fill the gaps.
And after all why not imagine angels with fins instead of wings? At the end Greeks know well they stuff and have Poseidon!
Is as well notable that religions and beliefs have evolve along the human history: each see our world thought different eyes... makes me wonder what could believe an aquatic human?
My last word could be: is not because you don't know, that he can not be... but believe what makes you happy!