The "mutations are inherently destructive" argument is normally made by young-earth creationists, and although those guys may be your intellectual brothers-in-arms, it's a fallacy to assume that you subscribe to their dogma. I should not have gone straight to the 6000 year old earth argument, and I apologize for it.
But still. Evolution is quote, glaringly questionable? Really? I love how you guys get wireless access to the immediate, worldwide Internet to post about how much science sucks. You're living in what would have been regarded even five hundred years ago as a freaking magical universe. Your house is warm in the winter and cool in the summer. You can sit in a chair inside a piece of metal and go across the ground six times faster than a horse can run, or you can sit in a chair in the sky and fly across a continent in three hours. You have a piece of glass in your house on which you can watch what other people are doing all the way around the world. You know when it's going to rain three days ahead of time. Your water does not make you sick when you drink it. All this stuff is thanks to science -- European and American science, specifically, if you want to get jingoistic -- and yet the second that any arm of this benevolent scientific framework (astronomy, physics, biology, anthropology, etc.) that has shaped every minute of your pampered magical life runs up against the first book of Genesis, you're willing to throw the whole thing out and shriek about its horrific agenda.
My dad is a devout Christian who believes in the Big Bang, who believes in evolution -- and who believes that God intimately directed all of it for his own purposes. Science is not the enemy. Unless, of course, your air conditioner and your car and your TV and your computer and your grocery store and your weather forecast are also the enemy.