The vast majority of these Muslims are coming to Saudi Arabia in order to perform the HAJJ or ritual pilgrimage that Muslims should make at least once in their life to Mecca, which is a city within Saudi Arabia.
yes
to offer Hajj at makkah
near 20% of saudi arabia people are shia Muslims
mecca is in Saudi Arabia
Most Saudis are Muslims, but many migrant workers in Saudi Arabia are Non-Muslims (primarily Hindus and Christians).
Saudi Arabia
Saudi Arabia
Saudi Arabia to the Ka'ba.
That city is called Mecca - it's on the west coast of Saudi Arabia - close to the Red sea.
About 28 million of the inhabitants of the UAE are Muslims. Saudi Arabia's population of about 23 million Citizens are 100% Muslim and have no choice in deciding their religion. There are also approximately 6 million foreigners, 5 million of whom are also Muslim.
About 10-15% of the population of Saudi Arabia is Shiite, so about 2.5 - 4 million people.
Yes, most travelers need a visa to travel to Saudi Arabia.