The Houses Theory of "Islam" -- where does it come from?

[The Wizard]

It is an Islamist talking point, same as "War on Terror" and "Axis of Evil" have been US talking points.

That was my assumption, as well. It seems that dar al-harb was not first mentioned until the 13th century, when the Islamic world was cracking and crumbling on all sides under the onslaught of the Mongols. The coming of the terms to what they are now are likely the result of the teachings of Sayyid Qutb...