There's a huge difference between saying you disagree with someone, and saying that that person/religion is not Christian. I'm fine with you saying you disagree with Catholicism. Or Mormonism, for that matter. But by any reasonable definition both Catholics and Mormons are still Christian.
Joseph Smith, Jr., History of the Church, v. 1, p. xl: "Nothing less than a complete apostasy from the Christian religion would warrant the establishment of the Church of Jesus Christ of Latter-day Saints.”
Joseph Smith, Jr., Teachings of the Prophet Joseph Smith, p. 270: "What is it that inspires professors of Christianity generally with a hope of salvation? It is that smooth, sophisticated influence of the devil, by which he deceives the whole world"
John Taylor, Journal of Discourses, v. 13, p. 225: "What does the Christian world know about God? Nothing... Why so far as the things of God are concerned, they are the veriest fools; they know neither God nor the things of God."
The LDS church today keeps saying "we're Christian" because "Jesus Christ" is in the title of their church. But Joseph Smith never identified with the "Christians," but rather demonized them (as did succeeding Presidents of the church).
https://mormonthink.com/QUOTES/christianity.htm
Jesus told his followers that many would come in His NAME, but be ye not deceived. Just because someone claims to be Christian doesn't make it so. God either knows you or He doesn't. But "Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?"
23 And then I will declare to them, 'I never knew you; depart from Me, you who work iniquity.'"
This whole who is a Christian thing is tricky because of all the different splinters within Christianity, not to mention the actual wolves in sheep's clothing Jesus warned of (Rome declared it was Christian and became "Holy" Roman, but then taught things that weren't in scripture - and wouldn't let anyone have a Bible in their own language so people couldn't check how wrong the Catholic leadership were). Now, I believe that there could be true Christians within Catholicism (they may have been born into it and it was their only avenue of knowing Jesus). I was born into mormonism, and I learned about Jesus there. Some of it was true. Some of it was not. But luckily the truth outweighed the lies and pulled me out of mormonism. Mormonism today is very nice - they're nice people, who try to be good. But the roots, in spite of the propaganda we grew up with, are not good. The roots of Catholicism are Rome and its fruits are the inquisition and the crusades. And now we have people who point to the crusades and say "that's why I'm not a Christian" because they only see the surface. There are people who are evil, or blinded by lies, everywhere. The world is full of sinners and hypocrites, even with in Christ's body of believers. But our salvation is already paid for on the cross and when we admit we are sinners and hypocrites, when we admit our pride and are truly humble and penitent and desperate, as vile as He has declared us to be in His holy Word - it is then we are saved by His grace.
I would imagine if Mormons were around in Paul's day (humor me) then he would've writen a stern letter to the Mormon sect, correcting their false teachings, as he did with the Galatians or Ephesians, etc. But Mormonism teaches with certainty - with pride - that they're the only true Christian sect on the face of the earth. And they refuse to be corrected. This statement made in sacrament meetings everywhere is not a statement of faith, but rather a statement of pride. I sympathize with my mormon brothers and sisters' love of Christ, but I don't excuse their pride. That's on me. I'll try to be more understanding and patient, because He wants me to be. But my salvation is not dependent on my actions.
Go Jazz!
Anyway, you might be unaware that the LDS church also teaches that we are saved by grace. We are also judged by our works. And if your works are evil, Christ's grace won't save you.
If you believe this will you please provide a scripture as support for this claim. Try Galatians. In fact, to all my fellow Jazzfanz who are wondering about this salvation by works vs. grace debate, I recommend Galatians. Although Paul addresses it in other epistles as well.