In context, this "sword" verse by Jesus could be meaning the enmity it brings between an individual that accepts Jesus and their family, especially considering that most Jews did not accept Jesus at their Messiah. There is also this verse below which is obviously a literal sword. There are...
I guess it depends on what one believes about God or who they believe is God. If it is the God of the bible, then it is clear what he did for human beings.
Muhammad speaks revelation to mankind along with coming to wage war, unlike Jesus. Vastly different aren't they? Why would Jesus send someone so polar opposite to him. I am not sure who Muhammad was comforting, but his actions are not very comforting.