The european started to embrace the islamic teaching in the late 20th centuries.
If we're solely talking about the 700s Period, the answer would be : They wee threatened by it and sought to stop it
Back then, they believe that the islamic expansion would bring a huge threat for their current religious system
hope this helps
<span>The perfect right of kings or heavenly right is a political and religious tenet of legal and political authenticity. It declares that a ruler is liable to no natural expert, inferring the privilege to govern specifically from the will of God. The lord is in this way not subject to the will of his kin, the gentry, or some other bequest of the domain</span>