I went to public school in the northeast and not once was the bible used in school. Nor did any religious topics come up in any of my classes, beyond your standard Greek and Roman mythology. I wish they had dug deeper into other mythologies from around the world. I don't recall prayers in school, but at events it definitely came up which is inevitable given that the Hispanics comprised the majority of the student body.
If you don't think these topics aren't debated overseas then you clearly haven't traveled enough. I've seen both Europeans and Asians question evolution and not necessarily on religious grounds. While living in Asia one guy went on a tirade about it and how dissenting views should be taught in schools; similar to the crap we see here in the US. I disagree completely, but it's just not worth arguing with some people. I take it you've never met a born again Buddhist, because they're not all that different than your average fundamentalist Christian.