The crusades fought on the basis of religion occurred in the continent of

Most of the crusades were fought in Asia

Asia. The crusades were wars that were both religious and political. They were from 1096-1291 and were battles over control of the Holy Land. Europeans captured Jerusalem which is found on the continent of Asia but is close to Africa and Europe so people often are confused. The crusaders were from Europe but wanted the Holy Land, Jerusalem, which is technically Asia.