Neither the Judaics nor the Catholics created Islam. The whole region including the Arabian peninsula was full of Catholics.
Catholics were simply Christians then. There was no split. Islam blossomed as a cultural cult with warlike tendencies,
conquering gradually, as the Christians were focusing on Europe more and more, and there was a period of general defenselessness
since the Roman Empire (Byzantine) fell in the region... so the Sasanians (Persians), right before they became Islamic, took the Levant,
and the Jews massacred approximately
66,000-90,000 defenseless Christians at the Mamila Pool in 614.
The Jews actually BOUGHT the Christians from the Sasanians who they partnered with, along with other Babylonian pagans, to take down the Christians in Jerusalem. They ransomed them from the Sasanian military, the Sasanians thought they were going to be slaves, or possibly were even told they simply wanted to free them, but they murdered them instead. Then, the Sasanians stopped the Jews from murdering the Christians, and they turned against the Jews. Those Christians who remained alive fled, as quickly as possible.
The Mohammedans continued picking apart small groups, growing, they were a cult, not unlike some previous Gnostic heresies, but this time they were much more violent and an odd synergy of Judaism, Christianity, and Nabatean paganism mixed with the tyrannical rule of Mohammed. Eventually (within about 20 years) the Persians themselves were conquered in the region by the clans and caliphs of Islam. Both Christians, then Jews fled north, and the entire region from this point until the Kingdom of Jerusalem (Crusades) was dominated by Islam. The Jews bagan to concentrate in what became Khazaria, the Khazar Khaganate. This was where the bulk of today's so-called Jews originate from, because the Khaganate forced the native pagans to covert to Judaism. When it fell, after a series of wars by the Arabs, then the Rus (Russians), many of them - the Ashkenazi - moved into Russia and Europe, keeping the religion which most of their forefathers were forcibly converted to. This is why "Jewish" DNA is so messed up. It is why some of them look Turko-Mongolian.