Nostra Aetate & source of claim Muslims and Catholics adore (not worship) the same God.

 https://www.facebook.com/notes/father-daniel-gagnon-omi/the-problem-of-nostra-aetate-no-16-and-religon-of-peace/1249107738456959/

In matters political Islam is a system of despotism at home and aggression abroad. The Prophet commanded absolute submission to the imâm. In no case was the sword to be raised against him. The rights of non-Moslem subjects are of the vaguest and most limited kind, and a religious war is a sacred duty whenever there is a chance of success against the "Infidel". Medieval and modern Mohammedan, especially Turkish, persecutions of both Jews and Christians are perhaps the best illustration of this fanatical religious and political spirit.

https://www.newadvent.org/cathen/10424a.htm

St Thomas Aquinas on Islam

…those who founded sects committed to erroneous doctrines proceeded in a way that is opposite to this, The point is clear in the case of Muhammad. He seduced the people by promises of carnal pleasure to which the concupiscence of the flesh goads us. His teaching also contained precepts that were in conformity with his promises, and he gave free rein to carnal pleasure. In all this, as is not unexpected, he was obeyed by carnal men. As for proofs of the truth of his doctrine, he brought forward only such as could be grasped by the natural ability of anyone with a very modest wisdom. Indeed, the truths that he taught he mingled with many fables and with doctrines of the greatest falsity. He did not bring forth any signs produced in a supernatural way, which alone fittingly gives witness to divine inspiration; for a visible action that can be only divine reveals an invisibly inspired teacher of truth. On the contrary, Muhammad said that he was sent in the power of his arms—which are signs not lacking even to robbers and tyrants. What is more, no wise men, men trained in things divine and human, believed in him from the beginning, Those who believed in him were brutal men and desert wanderers, utterly ignorant of all divine teaching, through whose numbers Muhammad forced others to become his followers by the violence of his arms. Nor do divine pronouncements on the part of preceding prophets offer him any witness. On the contrary, he perverts almost all the testimonies of the Old and New Testaments by making them into fabrications of his own, as can be seen by anyone who examines his law. It was, therefore, a shrewd decision on his part to forbid his followers to read the Old and New Testaments, lest these books convict him of falsity. It is thus clear that those who place any faith in his words believe foolishly.