What effect did Byzantine rule over Constantinople as well as the Islamic defeat by Charles Martel in 732 C. E. have on the spread of Islam?

The Byzantine was the Eastern Roman Empire which was known majorly as the Byzantine or Byzantium Empire, the emperor of Byzantine was the patriarch of Constantinople and the head head both church and the state. The effect that the Islamic defeat by Charles Martel on the Byzantine is that it weakened the Islamic armies and ended Islamic expansion forever.