Good grief. That is the exact, fundamental argument that Origin of the Species overturned 150 years ago. And early in his career, Darwin was just as convinced as you that ordered complexity = intelligent design. He could quote large chunks of Reverend Paley's book verbatim - Paley being the father of the "if I found a watch in the field I would know someone designed it" argument.How can anybody not believe in intelligent design? The complexity of animal life cries out that there's a creator. I could understand evolution itself if there was only plant life but how do you explain the development of complex organs like eyesight, hearing, and especially the brain? God said the atheist is a fool and they are very ignorant there is a God and if you don't believe it, that's the belief that will get you sent to hell.
Then Darwin found that it was not true. He found that intelligent design is just one way to achieve ordered complexity. He showed the mechanism. He made predictions based on this hypothesis.
And wherever we look, we find those predictions to be borne out by the physical evidence. Do you know Darwin predicted the existence of ape/human intermediates before a single one had been found? And now we have upwards of 22 species of ape human intermediates found.
Evolution both predicted these and explains them. Creationism did not expect them and has no explanation for them.