Colonel Robert Green Ingersoll (August 11, 1833 - July 21, 1899)
According to Wikipedia, Ingersoll "was a Civil War veteran, American political leader, and orator during the Golden Age of Freethought, noted for his broad range of culture and his defense of agnosticism."
Some Ingersoll Quotes:
The notion that faith in Christ is to be rewarded by an eternity of bliss, while a dependence upon reason, observation and experience merits everlasting pain, is too absurd for refutation, and can be relieved only by that unhappy mixture of insanity and ignorance, called "faith."
The inspiration of the Bible depends upon the ignorance of the gentleman who reads it.
No man with a sense of humour ever founded a religion.
It may be that ministers really think that their prayers do good and it may be that frogs imagine that their croaking brings spring.
More Ingersoll quotes HERE.