The Blind Watchmaker by Richard Dawkins.
Ok, so its not really a philosophy book, but it would definately allow you to make more informed additions to any Evolution vs Creationism argument.
It also does well to dispell much of the misconceptions behind evolution, such as a misunderstanding of puctuated equilibrium.
I reccomend this book, even if you don't particularly like Dawkins, as a person. He still writes with a great deal of clarity - it is my opinion that anyone who reads this book, and takes in all they read, will finish with no doubt about Natural Selection and evolution.
To me philiosophy and science are one and the same.
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