As the first in a series of posts dedicated to helping anti-Mormons focus their time more effectively, allow me to start by pointing out the futility of trying to convince Mormons that they are not Christians or that they don’t believe in Christ.
The problem with this mode of attack is that Mormons sincerely believe they are Christians. You can tell them all day long that they aren’t, but they simply won’t believe you. They’ll tell you that they do believe in Christ, that their church is named after Jesus Christ, that they believe in the Bible, that they believe Christ is their Savior, that their Book of Mormon mentions Christ on average every 2.5 verses, etc., and so from their perspective, they don’t understand where you’re coming from when you say they don’t believe in Christ.
From here, many anti-Mormons will slightly modify their tactic to make the claim that Mormons don’t believe in the same Christ other Christians do. This is similar to making the claim that Muslims don’t believe in God because their conceptions about God and His characteristics are somewhat different than those of mainstream Christianity. Anti-Mormons who follow this line of reasoning will have an easier time finding Mormons who are sympathetic, or at least willing to listen, since Mormons would agree that the conceptions held by mainstream or traditional Christianity regarding God and Christ are different in certain key ways than those held by Mormons.
The problem is that having reached this conclusion and mutual agreement with Mormons, you haven’t established to them that they aren’t Christians, just that they are, perhaps, a different type of Christian. But since the same can be said of Protestants and Catholics, this doesn’t provide much satisfaction.
Conclusion? Trying to convince Mormons that they aren’t Christians is an exercise in futility. They simply don’t buy it. Trying to convince other people that Mormons aren’t Christians can backfire as well, since if you tell someone Mormons aren’t Christians, but they then go to a Mormon church and see that the name of the church is The Church of Jesus Christ of Latter-day Saints, and they see all the pictures of Christ in the church, and they hear about Christ in the lessons and sermons, it can spark their curiosity. “How can someone say Mormons aren’t Christians?” they’ll wonder. “I need to look into this some more and figure this out.” This isn’t what you want to happen, so it may be best to just ditch the matter entirely and focus on other aspects of Mormonism.