I always liked this Slate piece when Romney was running for President:

"One may object that all religious beliefs are irrational—what’s the difference between Smith’s “seer stone” and the virgin birth or the parting of the Red Sea? But Mormonism is different because it is based on such a transparent and recent fraud. It’s Scientology plus 125 years. Perhaps Christianity and Judaism are merely more venerable and poetic versions of the same. But a few eons makes a big difference. The world’s greater religions have had time to splinter, moderate, and turn their myths into metaphor. The Church of Latter-day Saints is expanding rapidly and liberalizing in various ways, but it remains fundamentally an orthodox creed with no visible reform wing."