Crusade poems made defeated Muslims curse their own deity Mahomet

Evidence

Corbaran himself, as he sees his defeat, calls one last time on Mahomet, this time to curse and threaten him: “Oh, Lord Mahmet! How I used to love you And to serve and honor you with all my might! If ever I may return one day to my country I will burn you and reduce you to dust Or I will have you trampled by horses.” — John V. Tolan, Saracens, 676