Antony Flew on Evolution

Some more from Antony Flew:

In my book Darwinian Evolution, I pointed out that natural selection does not positively produce anything. It only eliminates, or tends to eliminate, whatever is not competitive. A variation does not need to bestow any actual competitive disadvantage. To choose a rather silly illustration, suppose I have useless wings tucked away under my suit coat, wings that are too weak to lift my frame off the ground. Useless as they are, these wings do not enable me to escape predators or gather food. But as long as they don't make me more vulnerable to predators, I will probably survive to reproduce and pass on my wings to my descendants. Darwin's mistake in drawing too positive an inference with his suggestion that natural selection produces something was perhaps due to his employment of the expressions "natural selection" or "survival of the fittest" rather than his own ultimately preferred alternative, "natural preservation".

'There Is A God' by Antony Flew, p78-9

I also read a few years ago, I think in some Christian scientist magazine, that any mutation that did prove beneficial to an animal (something that's never been witnessed), within a few generations that mutation would become so dilute in the gene pool it would be as if it never occurred.