Africa was the first continent into which Islam spread from Southwest Asia, during the early 7th century CE. Almost one-third of the world's Muslim population resides in Africa. Muslims crossed current Djibouti and Somalia to seek refuge in present-day Eritrea and Ethiopia during the "Hijrah" (, 'Migration') to the Christian Kingdom of Aksum. Most Muslims in Africa are non-denominational Muslims or Sunni; the complexity of Islam in Africa is revealed in the various schools of thought, traditions, and voices in many African countries. The practice of Islam on the continent is not static and is constantly being reshaped by prevalent social, economic, and political conditions. Generally Islam in Africa often adapted to African cultural contexts and belief systems forming Africa's own orthodoxies.