Are Muslims Monotheists?

Here’s an article on the Deity of Christ for Nina:
http://www.answeringmuslims.com/2011/06/where-did-jesus-say-i-am-god-worship-me.html
And here’s the original description:
http://www.answeringmuslims.com/2012/11/are-muslims-monotheists.html
According to Islam, the worst possible sin is “shirk” (associating partners with God). Yet Muslims commit shirk all the time, without even knowing it. In this video, David Wood and Sam Shamoun prove, from Islam’s most trusted sources, that Muslims have deified Muhammad. For more sources and evidence, visit the above link.