You can start with this website http://nigeria.usembassy.gov/ A letter of invitation is usually advised. They may also need to show strong ties to their country, such as family, a job, home, a bank account.
Quick Answer. Over one billion Muslims live in Asia, which makes it the continent with the highest Muslim population. Indonesia is the country with the largest Muslim population, with 209 million people. Continue Reading.
Sixty percent of the Muslim population lives in Kenya's Coastal Region, comprising 50% of the total population there. Roughly 4% of Muslims are Ahmadiyya, 8% Shia and another 8% are non-denominational Muslims, while 73% are Sunni.