For a great explanation of why the U.S. should pay more attention to international religious liberty in its foreign policy, see "Why Religious Freedom?" at the Hudson Institute's Center for Religious Freedom: http://crf.hudson.org/index.cfm?fuseaction=mission.
Here is an excerpt:
"Despite its central importance historically, politically and socially, the issue of religious freedom has been the most neglected human right in U.S. foreign policy. Because of either lack of interest or an understanding of religion's importance to most of the world's people, America's foreign policy establishment has typically failed to defend religious freedom as a principle or speak out on behalf of beleaguered believers. "