•Why it earns a slot
Why it earns a slot: it got Voltaire's book burned by the Paris Parlement and banned by Rome within months, and its entry-by-entry case for religious tolerance shaped the language European states still use to justify it.
An alphabetical demolition of Church, state, and superstition, entry by entry, where a magistrate begs Rome for divorce and a shepherd out-argues a theologian.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.