Muhammad was the final prophet because he delivered the final scripture. According to the Koran, he was not the last messenger (33:40). Any messenger to come after Muhammad is to preach and confirm existing scripture (3:81). Unfortunately, there is a strong human aversion to the idea of a living, "contemporary messenger." The Koran teaches that Muhammad was ridiculed by his contemporaries: "Is this the one who claims to be God's messenger?" they said. "Is this the one who disrespects your gods?" "Why didn't God commission a better man?" (21:36, 23:44, 25:41, 43:31). The prophet Joseph
was treated with suspicion and contempt, then, when he died the people declared that he was God's last messenger (40:34).
The vast majority of Muslims believe that Muhammad was the last messenger, even though this idea goes totally against Muhammad's teachings (7:35, 33:40).
God has provided powerful, physical, proof in support of my mission as His commissioned messenger to the New World.