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This Intelligent Design Creationism argument is called the Argument from Personal Incredulity. It is a logical fallacy. Evolution is smarter than you are.Further, complexity is not evidence against evolution, it's precisely one of the things evolution is expected to produce.Intelligent Design Creationism is not science in the slightest.To specifically address gecko feet. There is no need to assume they originated fully-formed and able to stick to smooth inclined surfaces perfectly. Is it really that difficult to visualise that gecko feet evolved slightly better gripping properties than average over many generations? A simple scenario is that the first gecko (gecko ancestor) feet needed only crude projections, such as the scales on their toes, for gripping rough surfaces (most lizards don't have adhesive pads but get along fine without them). Further gradual modifications to those projections could allow geckos to move along increasingly smoother and more inclined surfaces, until, at present, they are effective enough to adhere to glass.
Also consider the feather, with its multiple levels of detail.