In the customer review section of When Christians first met Muslims, buyer A. J. Deus posts a fine review with the many flaws in the consensus scholarship represented in the readings. His website is here: ajdeus.org. Worth reading are his 2 articles about the Umayyads.
Go to the headings on the top until Publications, then hover your mouse over that for the drop-down menu, then hover over Working Papers, and the 2 are there, and free for downloading.