"Primary" can be defined as 'first' or 'most important'.
Judaism is the source of all modern monotheistic religions. It continues to be a source of spiritual peace and harmony to all people of all religions (if only everyone would be open to receiving that message).
"Primary" can also be defined as 'most populous'.
That answer would be Islam.
For Christianity, the Middle East (Israel) is the primary source for their religion.
The main religion of the Middle East is Islam.
islam
Islam
Islam
Islam
ISLAM is the religion of over 90% of Middle Easterners.
Islam is the primary religion of every Middle Eastern country except Israel, whose primary religion is Judaism.
relgion
Islam
middle east
political stability
political stability