It's not clear to me that a lot (or any) public school teachers are "teaching creationism". I think what is happening is that some teachers are refusing to worship at the altar of Evolution.
There is more to science than just Darwin.
It's not clear to me that a lot (or any) public school teachers are "teaching creationism". I think it is, or was, quite common, and I personally know one retired teacher who openly averred that he did this.