Which of these is a main unifying factor for most people who live in south west asia

Out of the given options, religious affiliation is the main unifying factor for most people living in southwest Asia.

Explanation:

All the countries of the middle east or southwest Asia are predominantly Muslim countries with the worlds highest concentration of Muslim population. In all the countries of the middle east, Islam is the official religion of the states and is backed and promoted by the governments. In countries like Saudi Arabia, it is mandatory for an individual to be Muslim to officially be a citizen of Saudi Arabia.