"Yes life organisms do progress from the simpler to the more complex but that doesn't necessarily disprove a creator" Exactly what Darwin himself said in his famous book, in fact he specifically stated that the process was initiated by a Creator. "In addition ALL mainstream Christian religions oppose evolution" Oops, the Catholic Church has stated that there is no objection to evolution. Hard to get more mainstream than that. Its more accurate to state that most Christians in the World (as opposed to, say, in Kansas) either accept evolution based on the evidence, or have no objection to evolution. Those Christians who do oppose evolution are primarily members of conservative fundamentalist sects, like Jehovahs Witnesses (but not limited to them) "It will be a big day when the evolutionists find a reptilian scale in the process of becoming a feather or the species that bridge the gap between a wolf like creature (ancestor of the whale) and the fish like creature that is the whale." Both have been observed, first in Archeopteryx, with is crude feathers unlike the feathers found in modern birds, as well as its beak full of teeth and claws on its wings. Archeopteryx is clearly a lizard on its way to becoming a bird, and has been viewed as such for well over 100 years. More recently, in Velociraptor, which better preserved fossils have shown to possess feathers, further solidifying the link between reptile and bird. This is why the first Jurassic Park movie did not show feathers (because the better fossils had not yet been found), and the later sequels did show them (because those films were made after the better fossils had been uncovered). As for the whales, there is a VERY complete chain of fossils, beginning with Mesonychids, the wolf-like ancestor, continuing through Ambulocetus, which is something like a crocodile (mostly aquatic, still able to walk on land), through Rodhocetus (like a seal), and through several other forms of whale which are now extinct, but clearly existed in the past. Further, modern whales STILL have the genes, now recessive, for rear limbs, and some are still caught with rear limbs. For more detail on whale evolution, read "At the Waters Edge" by Carl Zimmer "It's a massive transformation in anatomy don't you think? A wolf becoming a fish, long after a fish decided to become a wolf." Actually, whales are not fish, but mammals. Fish have gills and can extract oxygen from the water. Whales have lungs, just like their mammalian ancestors, and must surface to breathe. Fish swim by bending their spines left-to-right, while whales swim by bending their spines up-and-down, just as their mammalian ancestors did while running. Further, we can see intermediate steps of similar "land-back-to-water" evolution in creatures like otters (very capable swimmers, but still agile on land), and seals (even better swimmers, and very awkward on land), and manatees (fully aquatic). And, it should be mentioned that no creature "decided" to evolve in a particular direction. At some point in the past, the ancestors of modern whales found a better life, i.e. more available food, in and around the shore than in the forest. Generations of living in and around the water SELECTED those with traits better suited for aquatic life.