Over the years, I have heard many reasons given by sincere Christians in an attempt to explain why Mormons are not deserving of that label. Some say that Mormons are not Christians because they do not have an accurate understanding of who God is. Others say that Mormons are not Christians because they do not have an accurate understanding of who Jesus is. Still others claim that a Mormon cannot be a Christian because he does not have an accurate understanding of the Word of God. In essence, these and almost every other reason that I have heard can be stated more simply as: Mormons are not Christians because they do not follow sound doctrine. This seems to be why most Christians reject Mormonism as a false gospel.
But let's take a moment to consider the issue in light of Scripture. Does the Bible teach that we obtain salvation by following sound doctrine? Does it teach that one must have an accurate understanding of God, Jesus and the Bible in order to become a Christian? Is it even possible for us as mere mortals to have an accurate understanding of the things of God? The answer to each of these questions is, no. The Bible teaches that there is only one way to become a Christian, and it is not through adherence to a particular set of doctrines. According to the Bible, one becomes a Christian by accepting the truth of the Gospel which is spelled out for us in I Corinthians 15:3-4.
"Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning." (Proverbs 9:9)