Testament by Meslier
Jean Meslier (1664 – 1729), was a French Catholic priest who was discovered, upon his death, to have written a book-length philosophical essay promoting atheism. Described by the author as his "testament" to his parishioners, the text denounces all religion.
Meslier repudiated not only the God of conventional Christianity, but even the generic God of the natural religion of the deists. For Meslier, the existence of evil was incompatible with the idea of a good and wise God. He denied that any spiritual value could be gained from suffering, and he used the deist's argument from design against god, by showing the evils that he had permitted in this world. To him, religions were fabrications fostered by ruling elites; although the earliest Christians had been exemplary in sharing their goods, Christianity had long since degenerated into encouraging the acceptance of suffering and submission to tyranny.
The following is some excerpts from his book.