The book "Letters to Eugenia; or, A Remedy against Religious Prejudice" was written by Baron Holbach, a French philosopher of the Age of Enlightenment. In this work, the author presents a series of letters in which he explains his skeptical position regarding religion and worship. Addressing the imaginary addressee Yevgenia, he reveals the shortcomings of church doctrine, religious beliefs and rituals, prompting the reader to think and introspect. The book "Letters to Eugenia; or, A Remedy against Religious Prejudice" is known for its frank criticism of religion and appeal to reason and understanding. This is an important philosophical work that prompts the reader to discuss complex and topical issues of faith, doubt, and morality.