which means both are just stories, and both suffer from having no eye-witnesses. If either of them were true, all scientists would have accepted it unanimously as they do with rest of the Laws such as Law of Gravity.
Um, no. To equate evolution with the various creation myths is to demonstrate a fairly profound lack of understanding of what evolution is and why virtually (almost) all biologists recognize it as at least as well supported as the heliocentric model of our solar system. As OneEyed Joe already noted, some biologists argue over variations in certain aspects of evolution (and this is normal in any field of science), but the vast, vast majority acknowledge that common descent as close to being proven as anything can be and that natural selection, while perhaps not the sole engine of change, is a significant design force.
And who said an eyewitness is necessary for something to be true? There was no eyewitness to the Big Bang, or to numerous other historical phenomenon. Moreover, natural selection has been witnessed in person, both in the lab, in digital models and in the wild.
Evolution is one of the those subjects that is, admittedly, complex. It takes time and effort to actually dig into credible, authoritative sources and learn about it, enough to separate what is factual from what is commony believed. Unfortunately, popular media doesn't help in this regard, especially when it uses misleading headlines bandying about terms like "missing link" or phrases suggesting that everything scientists used to believe needs to be changed.