I’ve set with dozens of Mormons and showed them stuff in the book of Mormon that they saw with a “deer in the headlights” look. They didn’t admit it, but these were things that they had never seen before and they were in my living room or office to introduce me to the book of Mormon.
For example in an 1830 Book of Mormon 1 Nephi 11:18 reads “And he said unto me: Behold, the virgin whom thou seest is the mother of God, after the manner of the flesh.” In later (or latter, lol) translations the Book of Mormon says in the same verse “And he said unto me: Behold, the virgin whom thou seest is the mother of the son of God, after the manner of the flesh.” Note the added phrase “the son of”. Mormons teach in Alma 7:10 that Jesus was born at Jerusalem, not Bethlehem. In Ether 15:30-32 the Book of Mormon has a guy getting his head cut off, then that same guy raising up on his hands and struggling for breath. In the 1830 Book of Mormon there’s a place where a King dies and then shows up a few chapters later, in the later translations they changed that King’s name to another still living King. I probably didn’t just pick the best examples, but the point is… many Mormons aren’t aware of some of this stuff.
I’ve talked to Catholics who have accepted Jesus Christ by faith and they believe that real faith sufficient for their eternal life, and I agree. But at the same time they don’t realize that the Catholic church teaches that a series of works called Holy Sacraments are really a part of traditional Catholic Soteriology, theology of salvation.
Lately I’ve encountered lots of Calvinists through videos, blogs, books, conferences, and even family. I’ve also been studying Church History, and I am quickly approaching the Reformation period in my teaching. I’m currently digging as deeply as I can into the different theories of the atonement. These studies and MULTIPLE conversations have led me to believe that many Calvinists don’t realize that many other Calvinist believe that God hates lots of people (actually most people). I’m sure there are many people out there today attending Calvinist churches and as lay people they have no idea what their leaders and traditions actually teach. Calvinism OFTEN leads to an exclusive teaching that often includes hate. I’m sorry to be so bold, but Calvinists teach hate. We all become like whatever we worship, and many Calvinist teach and worship a God of hatred not a God of love. They sometimes use their words carefully, but they essentially teach that because God is love, His love requires Him to hate sinners. I believe that “the Son of God appeared to destroy the works of the devil” and that God’s wrath is poured out on evil, not people. I believe that God loves you.
Remember the song: “Jesus loves the little children, all the children of the world. Red and yellow, black and white, they are precious in His sight. Jesus loves the little children of the world.” Calvinists can’t really sing that song, because they actually believe that Jesus loves some little children and He hates others.
I heard an old song once that was sung in Calvinist / Reformed circles that said in essence that they were glad that heaven wouldn’t be over crowded due to God’s Unconditional Election. They were glad to be the elect ones chosen by God and they were glad that God didn’t elect more.
Below I’ve inserted a photograph that I took from a page of the book “Doctrine: What Christians Should Believe” by Mark Driscoll, Gerry Breshears. This hatred leads to more hatred. Below the picture, I’ll give you a few links to more Calvinists who teach that God hates various people.

http://www.articlesbase.com/religion-articles/understanding-calvinism-one-tulip-at-a-time-479626.html
http://winteryknight.wordpress.com/2010/06/26/understanding-calvinism-with-this-funny-little-quiz/ (If you are a serious Calvinist don’t go here… it is a joke making fun of you. Sorry.)
http://www.oldtruth.com/calvinism/balanced.html (on this page notice extent of the atonement and preaching of the atonement, the two beliefs are contradictory if we are honest. One says that Jesus died only for some, but that His death had the power of all… they want to teach that Jesus died for only some, but offered salvation to all. It’s like offering a cookie to a person behind bars, but never carrying the cookie close enough for them to reach through the bars and get it. Calvinist may even admit that this is a good illustration, except they would argue that the person behind the bars never wanted the cookie, while others were taken out of prison and the cookie was forced upon them until they began to believe the cookie tasted good.)
Calvinists will be mad that I include Westboro Baptist Church links, but go to there beliefs page. They clearly claim to find their roots in reformed theology.
http://www.godhatesamerica.com/common/html/john316.html
http://www.godhatesfags.com/