You know there are like, thousands of different religions, right? You really think it's important for people to learn the basics of every single one of them in school? Besides the fact that this is a terrible idea, it's not mathematically possible. And anyway, where do you draw the line? Should we teach kids in school about White Supremacy? Neo-Nazism? Those are points of view, you really think we should teach them in school?
Of course you don't. So why do we pick and choose?
It's one thing to say "here is what science currently holds, also there are many many religions that do or don't conflict with them, if you are interested you can find more info here _____" and another to actually teach "Here's evolution, also Christianity says all of these things, let's focus on those for a few chapters" which is closer to what happens today.
We don't have the time to teach religious theory in tandem with science, and with the advent of the internet, we don't need to. If someone really wants to disappear into the realm of spirituality, they can do it on their own time, not that of teachers and students who want to learn things that can be and in some cases have been proven.