“As we have seen, Muhammed had neither supernatural miracles nor natural motives of reason to persuade those of his sect. As he lacked in everything, he took to bestial and barbaric means, which is the force of arms. Thus he introduced and promulgated his message with robberies, murders, and bloodshedding, destroying those who did not want to receive it, and with the same means his ministers conserve this today, until God placates his anger and destroys this pestilence from the earth.
[…]
(Muhammad) can also be figured for the dragon in the same Apocalypse which says that the dragon swept up a third of the stars and hurled down a third to earth. Although this line is more appropriately understood concerning the Antichrist, Mohammed was his precursor – the prophet of Satan, father of the sons of haughtiness.
[…]
Even if all the things contained in his law were fables in philosophy and errors in theology, even for those who do not possess the light of reason, the very manners (Islam) teaches are from a school of vicious bestialities. (Muhammad) did not prove his new sect with any motive, having neither supernatural miracles nor natural reasons, but solely the force of arms, violence, fictions, lies, and carnal license. It remains an impious, blasphemous, vicious cult, an innovention of the devil, and the direct way into the fires of hell. It does not even merit the name of being called a religion.”
St. Juan de Ribera (d.1611), Archbishop of Valencia, missionary to Spanish Muslims, and organizer of the Muslim expulsions of 1609 from Spain. Quoted in several locations from his 1599 Catechismo para la Instruccion de los Nuevos Convertidos de los Moros
https://onepeterfive.com/what-did-the-saints-say-about-islam/