As I was saying before regarding secret combinations, the Book of Mormon actually supports the trinity. This aspect was later discarded.
Mormons cite the latter, and ignore the former. The Book of Mormon is actually fairly ignored in general as doctrine issues go.
Not according to the Gnostics.
This specific subject is far muddier than you're implying. Mormon views on the afterlife are Fire-and-Brimstone adapted for a Universalist outcome, as contradictory as that may seem. Almost everyone is saved, but mormons believe one should NEVER settle for just being saved. There are multiple levels of heaven, and the exclusive club at the top is the only thing people should ever consider.
BTW, the Book of Mormon condemns Universalism.
Disagreement over details regarding the second coming is common among sects of Christianity. After all, not everyone believes in the rapture.
While your point holds, I'll just be an ass here and say that the United States of America didn't come into existence until the late 18th Century. Jesus didn't visit there.
There's a little rhetorical sleight of hand here. If you believe in the Trinity, then praying to God the Father is also praying to Jesus, and vice-versa.
Regardless, your post is entirely in terms of Catholicism and Protestantism but you
completely ignore that neither are Christian themselves if you ask the
Eastern Orthodox sects. Given the natural and historical diversity present among Christian faiths and my own personal disinterest in assigning 'good' or 'bad' just depending on how they are classified, I fail to see the importance in excluding Mormonism.