I came across this great article talking about the differences between Mormons and Evangelicals. I highly recommend reading it. It can be found here: http://www.deseretnews.com/article/700201923/LDS-Christianity-Differences-that-matter.html.
Also – included in the article is a nice graphic showing some of the major differences. Link
ps I believe that both groups are Christians. Both believe in Jesus Christ and that He is our Savior and Redeemer. We might have differences, but we actually have a lot more in common (esp from a values standpoint) than we realize.