I have often said that a person rejects evolution and stubbornly holds to Creationism or Intelligent Design not because of the evidence, which overwhelming supports evolution, but because of a deep theological problem. Recently a post on Aardvarchaeology by an ex-Catholic priest said it well:
“My most recent concerns present more of a challenge as I begin to look at the idea of Original Sin, which is key to the entire concept of a Christian soteriology or “Theory of Salvation”. If man was not created in the beginning as one pair, man and woman, Adam and Eve, then who sinned that humankind needs salvation? If we believe that man evolved over tens of thousands of years, maybe more, from a lower and less advanced animal, how on earth can we believe that one of those first sentient beings was culpable enough for his own actions to be responsible for “damning” all his progeny? If I manage to pull through this one with my faith I’ll let you know.” (Michael Merren)
Bingo. You can’t get much clearer than that. This is the real reason evangelical Christians must fight against evolution. The core of their faith is at risk. It has always surprised me that the Catholic Church accepts evolution as it sows the seeds of its own doom.