Northern Africa (just answered in apex)
Muslims currently live all around the world, not just in the middle east
Middle East
Yes, for Islam originated in the Middle East, along with Judaism and Christianity.
This question as composed is incomplete. You have to say more than where? For example, there are fewer Muslims in the Middle East alone than the Indian Subcontinent (Pakistan, India, and Bangladesh). However, there are more Muslims in the Middle East than in Iceland.
Most Middle Easterners are Arab Muslims, but there are significant populations of non-Arabs in the Middle East and significant populations of non-Muslims as well.
The Muslims conquered Iraq, Iran, and Siberia.
Currently, there are around 320 million Muslims in the Middle East, roughly 90% of the Middle East population.
The largest populations of Sunni Muslims are in Indonesia, South Asia, the Middle East, North Africa, and Southeastern Europe. There are increasing populations of Sunni Muslims in Western Europe and North America.
The way the question is phrased (using the word "Islamic") refers to land. Since 99% of the Middle East is owned by majority-Muslim countries, 99% would be your answer. If you intended to ask what percentage of the Middle East is Muslim, i.e. referring to humans. roughly 90% of all Middle Easterners are Muslims. The largest non-Muslim populations in the Middle East are the Egyptian Copts (roughly 8 million people) and the Israeli Jews (roughly 6 million people).
Yes. More than 90% of Middle Easterners are Muslims.
No. There are substantial (but declining) populations of Christians and Jews in the middle east. Not entirely, but close. The overwhelming majority (>90%) of Middle Easterners are Muslims. Jews, Christians, Druze, and Baha'i make up around 7-8% of the Middle East cumulatively.