In 1985, Carl Sagan was invited to be the speaker on the centennial of the Gifford lectures in Scotland. His lectures were later published in the book, The Varieties of Scientific Experience - A personal View of the Search for God. Here is a comment, from page 143, that he made about the LDS church.

"There is a religion that believes that in the nineteenth century a set of golden plates was prepared by an angel and dug up by a divinely inspired human being. And the tablets were written in ancient Egyptian hieroglyphics and had on them a hitherto-unknown set of books like those in the Old Testament. And, unfortunately, the tablets are not available for any scrutiny these days, and in addition there is powerful evidence of conscious fraud at the time that the religion was founded, whick led, last week, to two people being killed in the state of Utah, having to do with some early letters from the founders of the religion that were inconsistent with doctrine."

That's a great quote. Sagan nailed mormonism very quickly.