Because for some it is “magic” or NOTHING.
Unless God created the world using magical mystical miraculous means - they think there is no need for a God if God used the natural laws HE designed to carry it out.
The Bible says that I am formed “from dust” and “to dust” I will return. I was also formed via cellular processes involving DNA. Was my creation “from dust” less literal than the creation of Adam “from dust”, or is it possible that cellular processes involving DNA were also involved in the creation of Adam?
I wonder how impressed God is with that idea?