Zen One of the things that creationists so often fail to appreciate in arguments on evolution is the sheer amount of time involved. Life has been on Earth somewhere between 3 and 4 billion years. The time involved is literally beyond human conception. We cannot envisage one million, let alone a billion. This makes your argument about small changes quite invalid. Certainly mutation and genetic recombination variations are mostly quite small. However Silbury hill, a prehistoric grave site, at 40 metres high, 2 hectares area, and over 200,000 tonnes, was built by individual men carrying baskets of dirt up the hill and dumping them (500 men for 15 years estimated). Small changes over a long period equal massive net changes. If, every generation, a tiny genetic change happens in a population, then over trillions of generations, we end up with a total change that is massive and profound. On fossils, again. Paleontologists now have amazing dating techniques, which can usually place a bed of fossils in geological time. So each type of fossil will be known to be of a certain age, plus or minus an error factor (usually under 5%). The progression of changes in the fossil record across time fit very nicely in the time line for evolution. For example : Archaeopteryx precedes true birds. The first agnathans preceded the jawed fishes. Shark relatives preceded bony fishes. It has been said that evolution would be easy to disprove. Just find a rabbit fossil in Precambrian sedimentary rock. That has never happened. Any fossil way out of its time line would cast the same level of doubt. Again, apart from a few obvious hoaxes, that has never happened. Evolution has no direction, and no motive. But there are, nevertheless, overall trends which can be seen over time.