In Toland's first book Christianity not Mysterious (1696), he argued that the divine revelation of the Bible contains no true mysteries; rather, all the dogmas of the faith can be understood and demonstrated by properly trained reason from natural principles.
Dalam buku pertama Toland Christianity Not Mysterious (1696), ia berpendapat bahwa wahyu ilahi Alkitab tidak mengandung misteri yang benar, melainkan, semua dogma iman dapat dipahami berdasarkan prinsip-prinsip alam.