seedy3,
That's called the argument from incredulity. It's one of those logical fallacies. Basically, it goes something like: "I don't see how that is possible, therefore it's impossible." Like it or not, evolution is an established fact. Speciation has been observed under laboratory conditions and in the real world. The fossil record shows a gradual development over time. DNA evidence supports this. You mightn't like it but it's true.
Your idea of "terraforming" is interesting but there is no evidence for it, nor does it explain anything better than the theory of natural selection, and it postulates beings more advanced than those known to exist. For these reasons, it has to be rejected.
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Ubi dubium ibi libertas