"I saw two Personages, whose brightness and glory defy all description, standing above me in the air. One of them spake unto me, calling me by name and said, pointing to the other—This is My Beloved Son. Hear Him!
My object in going to inquire of the Lord was to know which of all the sects was right, that I might know which to join. No sooner, therefore, did I get possession of myself, so as to be able to speak, than I asked the Personages who stood above me in the light, which of all the sects was right (for at this time it had never entered into my heart that all were wrong)—and which I should join.
I was answered that I must join none of them, for they were all wrong; and the Personage who addressed me said that all their creeds were an abomination in his sight; that those professors were all corrupt; that: 'they draw near to me with their lips, but their hearts are far from me, they teach for doctrines the commandments of men, having a form of godliness, but they deny the power thereof.”-The Prophet Joseph Smith recounting his First Vision, when he saw and spoke to both the Father and the Son.
The problem with modern Christianity is that it has long abandoned the spirit of revelation. And without it, Christianity has become like the Pharisees and Sadducees of teh New Testament. Just as the Pharisees had a form of godliness, they based their lives on the Law of Moses, they had gone apostate and worshiped the words on a scroll more than they had worshiped God Himself. This lead them into all kinds of error, so much so that even though they had the words memorized backwards and forwards, they could not recognize the Messiah when He stood before them. They kept the form of the law, but denied the power of it and lost the Spirit of God. Much of Christianity is the same.
This is NOT to say that Christians are evil. Many, if not most, are amazing people who do their best to follow God. But what they have to guide them is so limited and misunderstood. Their teachers are without inspiration or revelation. So of course they screw up the doctrine and teachings of Christ. A man voting on which beliefs to uphold (as the early "Church" councils were essentially doing) cannot be right even most of the time. The real miracle is that they got it correct ever. But in the end many false doctrines and feelings entered the faith leading to false conclusions.
The thing to remember is that all people are flawed and are only trying to do the best they could with what they had/have. Don't hate someone because you don't have the moral authority or perfection to do so. You're just as screwed up as they are in your own way.