“Holy Spirit” in the Quran refers to the angel Gabriel. But “Holy Spirit” in Christianity is the 3rd person of the Trinity. As far as I know, they are not connected to each other, it’s just the same name being used for two different concepts. Perhaps the Holy Spirit of Christianity came from this original concept that the Quran refers to because the phrasing is connected to the mission of Jesus (peace be upon him), but Allah knows best.

He's not. He's Gibreel (alayhis'salaam). But his title of Ruh'ul Quddus roughly means holy spirit in the poetic, if not literal sense.

What violence? The prophet wasn’t harmed, he was shocked and got scared. Plus Wasn’t Paul blinded by the vision he saw? What about this? He was harmed. Or is that Jesus so it’s okay? And what does the first verses revealed say? Isn’t that what you would expect from God? Read in the name of your Lord, who has created (all that exists) has created man from a clot. Read! And your Lord is the Most Generous Angel Gabriel is mentioned in many places in the Quran and Hadiths, Surah 2:97 directly says that Gabriel revealed the Quran to the prophet, i don’t understand the problem.

The hilarious part in this is that Muhammad DID admit that Satan told him revelations once, and neither he nor his followers couldn't distinguish it until he got another revelation. I don't believe it either way though.