Kurds is the second largest group in Iraq.
No. Muslim Arabs are the largest group in Iraq, making up around 85-90% of Iraq's population.
Catholics
It depends on whether you consider "Arab" to be a united ethnic group or if it is divisible along ethno-religious lines. If Sunni Arabs and Shiite Arabs are distinct ethnic groups, then Sunni Arabs form Iraq's second largest ethnic group (after Shiite Arabs). If the Arabs are a united ethnic group, then the Kurds form the next largest ethnic group.
Yes. the majority of Iraq people are Shia Muslims.
The largest religious group in Russia and the western former Soviet republics are Orthodox Christians.
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catholic
The largest religious group in Afghanistan A+
Islamic
Chinese
Orthodox Christianity