Damasci sancti Petri Mavimeni, qui, cum diceret Arabibus quibusdam, ad se aegrotum venientibus: Omnis qui fidem Christianam catholicam non amplectitur, damnatus est, sicut et Mahumet, pseudopropheta vester, ab illis est necatus.
Thanks for your post: I hadn't thought to look there for the original Latin, even though I was considering looking for it somewhere and was all this time forgetting the most obvious place.
THE DEBATE SET OFF BY THIS POST IS UNNECESSARY
Sic transit gloria fori.
To be honest I din't think of it either. I just googled "mavimeni christianum catholicam" figuring that would bring up the original Latin and was surprised when it brought me back to the same site!!