The whole claim that Islam hangs upon is the prophethood of Muhammad. If the prophethood of Muhammad is disproven, then the whole of Islam is disproven. If the prophethood of Muhammad is proven, then Islam is the true religion.
In the Quran it says = “7:157. “Those who follow the apostle, the unlettered Prophet, whom they find mentioned in their own (scriptures),- in the law and the Gospel;- for he commands them what is just and forbids them what is evil; he allows them as lawful what is good (and pure) and prohibits them from what is bad (and impure); He releases them from their heavy burdens and from the yokes that are upon them. So it is those who believe in him, honour him, help him, and follow the light which is sent down with him,- it is they who will prosper.”
“Whom they FIND mentioned in their own scripures” This implies that Muhammad is the prophet the Quran is refering to. So if Muhammad is this prophet and the people mentioned are the Jews and Christians, this implies that the prophecies could be found in the law and the gospel at the time of Muhammad.
There is no evidence of the Torah, the books of the Israelite prophets or the Gospels being corrupted since the time of Muhammad. Since there are no prophecies in the Torah, the prophets or the gospels about Muhammad, this statement is proven false. A statement that is false cannot come from God as God is perfect and does not lie.