"Religion is poorly taught in school precisely because it teaches what the church wants."

What schools are you talking about? Religion is poorly taught in government schools because governments want to share is away from God. Religion is purely taught in some "Christian" schools based on their denominational flavor.

Most schools teach based on the intellectual level and academic interest of their students. These are both found to be severely lacking in western countries in my experience.

To put it bluntly, most people aren't smart enough and don't care enough to want the deeper meanings.