To suggest that any complex biological organism – it really doesn’t matter if it’s fish or fowl – could have come about from a billion-year sequence of random chemical reactions in some kind of prenatal soup in such a way that it evolves from atom to elephant is quite outrageous. Considering the functional detail and modular interdependence of any living being, and bearing in mind that it must have had the ability to reproduce itself from the outset or it would have been extinct upon the death of the first generation, and moreover, that it carries by dumb chance a blueprint of itself with a complete set of instructions that command equally dumb chemicals to build another one just like the progenitor; all this stretches the bounds of reason and credulity almost to breaking point.
But the alternative does nothing settle the conundrum of origins. To suggest that you and I came about because of the intervention of an omnipotent, omniscient divine intelligence that planned the whole caboodle from scratch and set us loose in a preconceived, precarious environment with deadly traps and ghastly predators in some kind of macabre game presumably for its own amusement, is even more preposterous. Adding details to this deity, like humanoid form, gender, love, anger, cruelty, and maliciousness, is to tempt the clutches of insanity. So, while there remain a surfeit of daunting, unanswered questions in either solution, we are left with no option but to choose the less improbable, or to admit our ignorance.
I submit that the only reasonably valid point of view with respect to the ultimate questions of cosmology is agnosticism.