Okay, if these verses don’t explain it, then nothing else will:
1 Nephi 14:
9 And it came to pass that he said unto me, Look, and behold that great and abominable church, which is the mother of abominations, whose founder is the devil.
10 And he said unto me, Behold, there are save two churches only: the one is the church of the Lamb of God, and the other is the church of the devil. Wherefore, whoso belongeth not to the church of the Lamb of God belongeth to that great church, which is the mother of abominations; and she is the whore of all the earth.
1 Nephi 14:
15 And it came to pass that I beheld that the wrath of God was poured out upon that great and abominable church, insomuch that there were wars and rumors of wars among all the nations and kindreds of the earth.
2 Nephi 10:
16 Wherefore, he that fighteth against Zion, both Jew and Gentile, both bond and free, both male and female, [both Catholic and Protestant], shall perish; for they are they who are the whore of all the earth; for they who are not for me are against me, saith our God.
How is that a description of the Catholic Church? Your familiarity with RLDS will not assist you in understanding true Mormonism beyond a certain point. You will need to dig deep within the LDS Church to understand the true doctrines of Mormonism.