Muhammad Vandestra 
What Is Islam Religion? English Languange Edition [EPUB ebook] 

The ultimate goal of every Divine Message has always been the same: to guide the people to God, to make them aware of Him, and to have them worship Him alone. Each Divine Message came to strengthen this meaning, and the following words were repeated on the tongues of all the Messengers: “Worship God, you have no god other than Him.” This message was conveyed to humanity by prophets and messengers which God sent to every nation. All of these messengers came with this same message, the message of Islam or Pure monotheism faith.