"When did Zawahiri or Bin Laden say their policy was “convert or die?”"
Exactly loonz, they haven't said this. Those that claim "it is has nothing to do with our foreign policy" and claim that they insist we "convert or die" must resort to lies and fabrication to backup their claim. For example, the ABC miniseries "The Path to 9-11" fabricated a fatwa quote about "until America converts to Islam" in order to push the lie that the al-Qeada insists we "convert or die." And here is the kicker, NO ONE in mainstream media (I haven't seen a single pundit or reporter) told the American people that "The Path to 9-11" fabricated a fatwa quote about "until America converts to Islam." That includes Media Matters which did do stories on "The Path to 9-11" but did not point out this fabrication.