William Tisdall, an experienced missionary, compiled a list of common questions about and objections to Christianity most commonly heard while working in the East. It is not intended to be a manual of Christian dogmatics, but only a handbook dealing simply and briefly with the most frequent Muslim objections to certain Christian doctrines and Christianity in general.
“C. Because the Qur’ân, which Muḥammad claimed to have received from God through the archangel Gabriel, asserts the authority and genuineness of the Bible which was then in circulation among the Jews and Christians, and declares that the Qur’ân itself was sent down as being ‘confirmatory of previous Scripture, and its safeguard2’” (Page 32)