Mark Twain's outspoken views on religion were often suppressed by his only surviving daughter and by Twain's own biographers. Twain directed that some of his writings not be published until 100 years after his death. This year, 2010, marks the 100th anniversary of Twain's passing. Finally, the autobiography that Twain wished to be published is being published in 3 volumes. The first was made available, just this month.
Here is one of the many things Twain had to say about religion in the new version of his autobiography:
"There is one notable thing about our Christianity: bad, bloody, merciless, money-grabbing, and predatory. The invention of hell measured by our Christianity of today, bad as it is, hypocritical as it is, empty and hollow as it is, neither the deity nor his son is a Christian, nor qualified for that moderately high place. Ours is a terrible religion. The fleets of the world could swim in spacious comfort in the innocent blood it has spilled."
An excellent review of the new autobiography can be found at: