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Had Muhammed died a marter because of what he was teaching, I might have been more compeled to believe he did actually speak to Gabriel. It would've showed beyond reasonable doubt that he believed in what he was teaching, and since he was the one that claimed to have witnessed Gabriel, this revelation would have been proved beyond reasonable doubt. (No offence intended to Muslims. I'm simply sharing my religious views, and as you know, in the Bible it says that Jesus is the only path to salvasion. And since Muhammeds teachings contradict this, I cannot believe him.)
Just for info, in Islamic history, it was stated that Prophet Muhammad was already known as al-Amin ('The Honest One') even before his appointment as Prophet (Gabriel's visitation) among the idol-worshippers of Mecca. His integrity, which brought him that title, convinced some of his closest associates that the visitation was real and truthful. However, you might not find this argument useful here.
Anyway, Muslims acknowledge that Jesus and his 12 disciples do exist. The disciples were known in the Qur'an as the 'Hawariyyun'.