Many Christian scholars have written about the history of Islam, both early and later periods, as it is a major religion with a significant impact on world history. They may have been motivated to study and write about Islam due to a variety of reasons such as religious or theological interest, academic curiosity, or to provide a historical context for contemporary events. Additionally, some Christian scholars have also written about the history of Islam in order to provide a comparative perspective with Christianity, to understand the similarities and differences between the two religions.