Ye say that those ancient prophecies are true. Behold, I say that ye do not know that they are true.

Ye say that this people is a guilty and a fallen people, because of the transgression of a parent. Behold, I say that a child is not guilty because of its parents.

And ye also say that Christ shall come. But behold, I say that ye do not know that there shall be a Christ. And ye say also that he shall be slain for the sins of the world –

And thus ye lead away this people after the foolish traditions of your fathers, and according to your own desires; and ye keep them down, even as it were in bondage, that ye may glut yourselves with the labors of their hands, that they durst not look up with boldness, and that they durst not enjoy their rights and privileges.

Yea, they durst not make use of that which is their own lest they should offend their priests, who do yoke them according to their desires, and have brought them to believe, by their traditions and their dreams and their whims and their visions and their pretended mysteries, that they should, if they did not do according to their words, offend some unknown being, who they say is God -- a being who never has been seen or known, who never was nor ever will be.

-- The Book of Mormon (Alma 30.24-28)

Edit: I'm mildly surprised by the reactions to this quote. The thing I find interesting about it is that Joseph Smith was apparently sufficiently familiar with Voltairesque anti-Christian ideas that he could relay them coherently and with some gusto. This goes some way towards passing the ideological Turing test.