Attempts to map interspecies human evolution are much less solid than claimed, the "missing link" being more a case of a missing 6 foot length of chain. A jaw fragment and a piece of thighbone are hardly a sound basis for how you view the universe.
Perhaps, but it is a chain millions of miles long. While long stretches of it are indeed missing, there are no known links that don't fit the theory. As mentioned before, this is because the theory is by it's very definition flexible enough to accomodate new information. This is the critical difference between scientific knowledge and religious faith. Science will always accomodate new data. Religion will steadfastly refuse to do so.