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> I have a hard time referring to them as Christians when they think that the non-Latter-Day Christians are someone that needs converted.

Yet I'm assuming you have no problem calling both Sunni and Shiite Muslims "Muslims" even though they each think the other is wrong and that the other needs converting to their way of thinking? Disputes about which church/sect is the one true church authorized by God are going to happen in every major religion. I think the term "Christian" though is generic - if you believe in and follow the teachings of Jesus Christ, you are a Christian.