Yeah, but Jesus also said in Matthew 7:22, "On that day many will say to Me, ‘Lord, Lord, didn’t we prophesy in Your name, drive out demons in Your name, and do many miracles in Your name?’ Then I will announce to them, ‘I never knew you! Depart from Me, you lawbreakers!’"
So this is the point--knowing Jesus. We know Him through His words. So, tell me whose words are more important, Jesus Christ's or Joseph Smith's? This is part of what Mormons testify to: "I know the Book of Mormon is the most correct book on the face of the earth." There are glaring differences between the Bible and the Book of Mormon, and Mormons are taught to place more weight on the Book of Mormon than the Bible.