"The Truth About Jesus" offers a series of studies on the question of the historicity of Jesus, presented before the Independent Religious Society in Orchestra Hall.
In "The Bible Unveiled" Mangasarian presents numerous evidences which prove that the Bible is not an authentic book but a compilation of older myths and legends.

Mangasar Magurditch Mangasarian (1859 – 1943) was an American rationalist and secularist of Armenian descent. During his life Mangasarian wrote a number of books. His most popular, including The Truth About Jesus — Is He a Myth? and The Bible Unveiled, deal with the evidence against the existence of an historical Jesus. He also wrote hundreds of essays and lectures on questions of the times. His books and essays were translated into French, German, Spanish, and other foreign languages. The general subject of his writing was religious criticism and the philosophy of religion.