It should be entirely up to schools what they teach children (within the boundaries of the law regarding free speech). Implement a voucher system and let parents decide what their children learn. So should creationism be taught in public schools? Not necessarily. Should public schools be allowed to teach creationism? Yes.
I know the Dutch educational context is quite different from the American one, and I'm concerned that I might be misunderstanding your point.
When you say "should public schools be allowed to teach creationism? Yes." do you mean state run schools should be allowed to teach it, or do you only mean schools that receive state funding should be allowed?