****Taking it as read that I end up having to answer question 3****
The constitution of the USA does not forbid the teaching of creationism in schools, it does however forbid favouring any single religion within a public institution - this presents a significant, but not insurmountable, problem for the teaching of the biblical version of creation.
The obvious solution therefore is to devote equal curriculum time to all religons and philosophies that espouse their own particular version of creation (according to wikipedia there are at least 60 such creation stories
Creation myth - Wikipedia ) with the remaining 50% of curriculum time spent teaching evolutionary biology.
Evidently this may have to happen at both the expense of the taxpayers (i.e. purchase of additional text books - one for each version of creation) - and the expense of the rest of the school curriculum (much if not all of which will be required to be cancelled in order to make room).