The simple truth of it is that if you call yourself Christian and are not Catholic, then you are a heretic.
Mormon, Jehovahs witness, Copt, it doesn’t matter.
Huh? I'll have to let my cousin, the Nun that, she considers herself a Christian. In fact she just had a celebration fifty years in her order, nice party. As a side note she refers to herself first as a Christian who also happens to be Catholic. I am sure she will love to hear your take on the whole thing. I have on my Dad's side uncles, aunts, and cousins galore and they ALL say they are Christian first then Catholic, I'll let them know as well. Pretty sure they will be surprised, then laugh.
Here is something from the Catholic view of Mormonism that addresses that pretty clearly.
“Mormonism itself is a belief system that would reduce the Father, the Son, and the Holy Spirit from being the three Persons of the one, true, and infinite God to being three limited, finite deities among an uncounted multitude of deities, all of whom merely reshaped small parts of a preexisting cosmos.
Mormonism teaches that human beings may, by practicing the tenets of its faith, become gods and goddesses themselves, with their own planets full of people worshiping them.
While the Catholic Church would reject nothing that is true or good in Mormonism or any other world religion, Catholic theology would have to note that there is a tremendous amount in Mormonism that is neither true nor good. Further, because Mormonism presents itself as a form of Christianity yet is incompatible with the historic Christian faith, sound pastoral practice would need to warn the Christian faithful: Mormon theology is blasphemous, polytheistic, and cannot be considered on par with the theology of other Christian groups.”
Are you SURE that you are a Catholic??
Jesus answered, “The work of God is this: to believe in the one he has sent.”