Robert Ingersoll may well be the most inspirational writer I've ever read.

Quote from "Heretics and Heresies":

The real Bible is not the work of inspired men, nor prophets, nor apostles, nor evangelists, nor of Christs. Every man who finds a fact, adds, as it were, a word to this great book. It is not attested by prophecy, by miracles or signs. It makes no appeal to faith, to ignorance, to credulity or fear. It has no punishment for unbelief, and no reward for hypocrisy. It appeals to man in the name of demonstration. It has nothing to conceal. It has no fear of being read, of being contradicted, of being investigated and understood. It does not pretend to be holy, or sacred; it simply claims to be true. It challenges the scrutiny of all, and implores every reader to verify every line for himself. It is incapable of being blasphemed. This book appeals to all the surroundings of man. Each thing that exists testifies of its perfection. The earth, with its heart of fire and crowns of snow; with its forests and plains, its rocks and seas; with its every wave and cloud; with its every leaf and bud and flower, confirms its every word and the solemn stars, shining in the infinite abysses, are the eternal witnesses of its truth.

A quote from Rober Ingersoll

[Science] found the world at the mercy of disease and famine; men trying to read their fates in the stars, and to tell their fortunes by signs and wonders; generals thinking to conquer their enemies by making the sign of the cross, or by telling a rosary. It found all history full of petty and ridiculous falsehood, and the Almighty was supposed to spend most of his time turning sticks into snakes, drowning boys for swimming on Sunday, and killing little children for the purpose of converting their parents. It found the earth filled with slaves and tyrants, the people in all countries downtrodden, half naked, half starved, without hope, and without reason in the world. Such was the condition of man when the morning of science dawned upon his brain, and before he had heard the sublime declaration that the universe is governed by law. For the change that has taken place we are indebted solely to science--the only lever capable of raising mankind. Abject faith is barbarism; reason is civilization. To obey is slavish; to act from a sense of obligation perceived by the reason, is noble. Ignorance worships mystery; Reason explains it: the one grovels, the other soars.