Yes, I was reading, (in the Book of Mormon) where one of the tribes got a curse that turned their skin black. I thought that it was in my notes but I can not find it. Such a thing is not acceptable to me. Looking, it seems that they have had a long struggle with racism. Some sources call it the Mark of Cain.
What you mention are sore points with me. As to the lie, it is in Genesis 12:17 and though I have not read it carefully, it looks like it happens more than once. That is in the KJV and not a Mormon peculiarity.
Frankly, I am not a member and attend for Communion and the Music. I hate to mention this but I used to attend an ELCA Lutheran Church and was disappointed to find that every word in church is already printed in the Program. I tried a 1st Church of Christ, and won't talk about it. To me the Baptists were to bizarre. I've been to a Catholic church. I attended an AG Church in Honduras. It is why I try to bridge the gap with personal reading and study. My mother used to attend a church in Oklahoma that had a lay pastorate. She once told me that her father would come home drunk on Friday night, beat his wife and children, lay around hung over on Saturday, and preach fire and brimstone on Sunday. Sad, so sad.