Did Mohammad Have Assurance of His Salvation?

Here is an interesting debate between Tony Costa and Bassam Zawadi on whether Mohammad had assurance of salvation. Obviously, for me, the key here is the grounds of salvation, and how this differs so fundamentally between Christianity and Islam. I posted these on my own site because what Tony possesses as a debater, he lacks as a geek. In fact, as embarrassing as this is, I had to be sent the files by mail. Yeah, the mail. Shocking!