Bad for the people who weren't Muslim because of the battles to expand Islam.
Islam is a religion. It was not 'founded'. Almighty God sent about 1,25,000 Prophets for the guidance of human beings. All of them preached Islam - Tauheed or ONENESS of Almighty God being its basic belief.
People of Arabian Peninsula worshiped idols, though they knew about Almighty God. People of Makka had placed 360 idols in the holy Ka'aba, each tribe worshiping its own god represented in the form of an idol.
The Arabian society was suffering from all kinds of social evils like injustice, illiteracy, ignorance, oppression, adultery, cruelty and exploitation.
People were intelligent but poor. Now they are ignorant and poor.
Arabian Peninsula ____________________________________________________________ Islam began by beginning of universe creation as Allah (or God in English and same God in Christianity and Judaism) created all creatures on basis of submission and surrender to His will (that means Islam). However, Islam per Quran revelation to prophet Muhammad (peace be upon him) began in Arabian Peninsula. Refer to related question below.
Arabian Peninsula
islam
The Arabian peninsula.
The religion of Islam originated in the Arabian Peninsula in year 610 AD, the date of revelation of the first verses of Quran by God to prophet Muhammad (PBUH) through the Angel Gabriel (Jibril).
In the Arabian Peninsula to the South West of Asia.
The Arabian peninsular.
Arabian Peninsula (Saudi Arabia)
islam
Islam was the religion that spread from the Arabian Peninsula to Africa.
People of Arabian Peninsula were not monotheist before the emergence of Islam. They were worshiping idols as partners to Allah (or God in English).
The Arabian Peninsula which is Saudi Arabia now