I think that both can be taught in schools as long as Creationism is taught under "Religious Instruction" and Evolution is taught under
"Science".
They are two different things. I was taught both in school in the UK and had no problem reconciling the two. The Bible is a "book" compiled from many very old texts. These texts are of historical significance, but they do not represent tales of fact or science. Since then I have worked for many years as a geologist on many continents and it did not take me long after school to understand religion for what it is - a "faith" not based on scientific evidence or definite fact.
Maybe you need to understand exactly what scientific enquiry is.