The Kingdom of Saudi Arabia.
The origin of Islam in its general meaning as full surrender to God; the Creator; dates back to the start of universe creation. However, Islam religion per Quran revelation by God to prophet Muhammad (PBUH) has originated in Makkah (or Mecca) in the current country of Saudi Arabia.
Muslims believe that Islam goes back to the prophet Adam - the first man - and so there is no original country. However; since Islam was distorted, Muslims believe the prophet Muhammad came to restore the message - the revival originated in the city of Mecca, in the country called The Kingdom of Saudi Arabia.
The prophet Muhammad (P.B.U.H) was born in Mecca (in Saudi Arabia).And it was Mecca where he got his first message from Allah.And also it was there in Mecca that he first started preaching Islam.
Believers in the faith of the Prophet Mohamed, consider Mecca as the origin of the religion. This is where the Prophet lived and is beneath the mountain where Abraham went to sacrifice Isaac. It is also the city with the Mosque that encloses the "Kabaah" and the destination for pilgrimage. The country is then the Kingdom of Saudi Arabia, Mecca is next to the Red Sea, south of Jeddah.
Islam started in mecca city of Saudi Arabia country.
but today many countries have Islam.