All of the various religions are based on fanciful tales. The problem for the Mormons is that they're religion's beginning was so recent it is well documented and therefore there is lots of objective evidence which demonstrates what sheer lunacy is required in order to believe in this particular faith. Even if you have no interest in the Mormon faith I highly recommend this book as a cracking story of how a two bit con man created a successful religion.
But if all the major religions today held a competition to see which was the goofiest, most blatantly, most demonstrably well documented pile of sheer unflinching bullshit, who would win? It's a tough call, but in this little book, I'd like to make a heartfelt argument on behalf of the Church of Jesus Christ of Latter Day Saints AKA the Mormons.