Yes. Most Arabs and Kurds are Sunni Muslim and most Persians (Iranians) are Shiite Muslims, but there are many religious minorities among all three of these peoples. Many of those minorities are oppressed in some or most of the nations where these peoples live.
Islam (muslims)
No. Pashtuns are a Central Asian people and share much more in common with Persians, Kurds, and Qashqai then with Arabs.
Iraq is primarily Arab with some minorities like Kurds and Yazidi in the north. Iran is a multi-ethnic country made up primarily of Persians, but also Dari, Pashto, and Balochs in the East and Kurds, Azeri, Circassians, and Arabs in the West. Persians consider themselves to be Caucasians, not Arabs.
Iraq has been shaped by numerous different ethnic groups over the centuries. Currently the dominant three are the Shiite Arabs, Sunni Arabs, and Kurds, but there have been countless other countries, powers, and ethnicities that have left their mark on Iraq.
NO. The Arabs are the largest ethnic group in Southwest Asia. There are at least 150 million Arabs in the Middle East, whereas there are only 35 million Kurds.
Kurds, Arabs, and Persians are ethnic groups that are primarily focused in the Middle East. Kurds are overwhelmingly Sunni Muslims, but there are minorities of Shiite Kurds (especially in Iran), Alevi Kurds, Yezidi Kurds, Yarsan Kurds, and other religious minorities. There are some Jewish Kurds who predominantly live in Israel. Arabs are predominantly Sunni Muslims, but there are large minorities of Shiite Muslim Arabs, especially in Iraq, Bahrain, Saudi Arabia, and Kuwait. There are also Ibadi Muslim Arabs, Alawite Arabs, numerous Christian Arabs, Druze Arabs, Baha'i Arabs, and other minority religions. Persians are overwhelmingly Shiite Muslims, but there are minorities of Sunni Persians, Jewish Persians, and several other minority religions.
Kurds, Arabs, and Persians are ethnic groups that are primarily focused in the Middle East. Kurds are overwhelmingly Sunni Muslims, but there are minorities of Shiite Kurds (especially in Iran), Alevi Kurds, Yezidi Kurds, Yarsan Kurds, and other religious minorities. There are some Jewish Kurds who predominantly live in Israel. Arabs are predominantly Sunni Muslims, but there are large minorities of Shiite Muslim Arabs, especially in Iraq, Bahrain, Saudi Arabia, and Kuwait. There are also Ibadi Muslim Arabs, Alawite Arabs, numerous Christian Arabs, Druze Arabs, Baha'i Arabs, and other minority religions. Persians are overwhelmingly Shiite Muslims, but there are minorities of Sunni Persians, Jewish Persians, and several other minority religions.
Arabs (420 million) are more numerous than Kurds (35 million) and Persians (70 million).
Islam (muslims)
Southwest Asia is one of the most diverse regions of the world with an incredible number of minorities and ethnic subdivisions within what are usually established as monolithic ethnic groups. The largest ethnic groups in Southwest Asia are the Arabs, Persians, Turks, Kurds, Jews, and the Copts.
No. Pashtuns are a Central Asian people and share much more in common with Persians, Kurds, and Qashqai then with Arabs.
In Amazigh Language and Culture (berbers and moors)
How long a list do you want? Pretty much every two bordering ethnicities in the Middle East have been feuding for the last few centuries, examples include: Arabs and Kurds Turks and Kurds Persians and Kurds Persians and Arabs Christian Lebanese and Sunni Muslim Lebanese Israelis and Arabs (including Palestinians) Settled Arabs and Bedouins Amazigh (Berbers) and Arabs Iraqi Sunni Arabs and Iraqi Shiite Arabs Alawites and Syrian Sunni Arabs and Druze Druze and Palestinians
The Kurds do not have their own country because Arabs, Turks, and Persians have consistently invaded and reconquered Kurdistan every time they have tried to assert independence.
Kurds are the second largest ethnic group in TURKEY(after Turks) and in IRAQ and SYRIA (after Arabs). In Iran, Kurds are the third largest ethnic group behind Persians and Azeris.
The Arabs are the most populous, but there are also Persians, Kurds, Turks, and numerous smaller minorities.
The Kurds are a distinct ethnic group from the Arabs that predominate in southern and central Iraq. They have a unique language, distinct holidays, a multiplicity of religions (some unique to the Kurds), and political autonomy in Iraq.