Really? Tell me, then, why do we scientific geek types bother constructing elaborate phylogenetic charts showing the relationship between various organisms (usually with respect to a single gene), how similar they are and how long ago they diverged, if the theory underlying the charts is false? So many biochemical observations support the theory; please enlighten me as to the experimental data or observations which disprove it? Keep in mind that while a theory cannot be conclusively proven (it's like proving a negative), it can be disproven by a single well-planned experiment. If such an experiment exists, I am as well qualified as anyone to judge its validity and scientific merit.
One example is Mendellian genetics. Because any allele has only half a chance of being passed on to the next generation, the spread of even favorable mutations is pretty much impossible. In addition, a gene is so complicated that the creation of new ones, coding for new faculties, new phenotypes, is also practically impossible.