Here’s what we know:
1. 13.73 billion years ago, the universe was created.
2. Somewhere around 4 billion years ago the Earth was created.
3. Around 3 billion years ago, life formed.
4. Life evolved and grew more and more complex and diverse.
5. Today there are millions of species.
The Intelligent Design (ID) movement, exemplified by the movie Expelled, has a problem with #4. They think God mucked around in #4. Science doesn’t have a theory (yet) for how the universe was created (#1). We know exactly what happened milliseconds after the Big Bang, but we don’t know how the Big Bang banged. We don’t have much of a theory about how life was created (although we are making significant progress) (#3). We have really, really good theories of #2 and #4. They are based on hardcore science and have been argued about and tested very thoroughly.
So if you are fervently religious and want to believe that God did #1 and #3, fine, great, have at it. We’ll probably prove you wrong on #3 someday but for #1, God snapping his fingers is as good of theory as any.
But why would you argue with #4? Evolution is obvious. Natural selection is obvious and if you think God is smart then he might think of a way to do things that was clever! He didn’t zap fully formed humans into existence He created a beautiful machine that opened up like a flower over billions of years from which stepped a mind capable of wondering and worshipping. Evolution is a testament to the patience and the brilliance of God. Science is never and could never be at odds with the will of the Creator.
So ID isn’t just bad science, it’s bad theology, it’s bad philosophy, it’s bad everything. It’s especially destructive because it falsely presents itself as being on the side of believers. That is nonsense. True believers are in awe of God’s creation, including the Big Bang, the old earth and natural selection. Science studies God’s creation, it doesn’t oppose it.