I think it's a wonderful idea that becomes impractical when you imagine the PTA meeting this is brought up at. People, I suppose, would be afraid that their children would find out that the religion they were born into isn't the one true religion. But really, if your religion is true why would you be worried about your child learning about false ones? It wouldn't be indoctrination, it would be education. Religion has been a major force throughout the history of mankind and should be put into context from a historical perspective. It would take an enlightened world populace to enact such a program but we do need to start somewhere. We can all make it a priority on our own to teach our children, and those around us, about the world's religions and see if it spreads. It's a lot harder to hate someone when you know who they are.
Image taken from: http://www.atheistmedia.com/2008_03_01_archive.html