By population, the largest number live in Indonesia,followed by Pakistan, India (although it is only about 13% of the population), and Bangladesh. The countries where almost all people are Islamic (Western Asia, Middle East, and Africa) have smaller total populations.
(see related chart link)
Islamic followers pray to Allah.
The answer is in your Question: Islam and its followers are called Muslim
As of today (July 22, 2014), the country singer with the most Twitter followers is Taylor Swift, with over 42 million followers.
There is a lot of places that have Islamic countries. The main Islamic country would be Bangladesh.
The Muslims. :]
Indonesia
Yes,
The largest Islamic country by population is Indonesia. The most important country in the Islamic religion, however, is most likely Saudi Arabia, as this is the area where Islam was founded.
The Yazidi, Druze, and Azali faiths are considered to be post-islamic religions. The Yazidi faith has 700,000 followers, the Druze faith has 2.5 million followers, and the number of followers of the Azali faith is not known.
It is difficult to predict with certainty whether there will be more or less Islamic followers in the future. Factors such as population growth, religious conversion, and social dynamics can influence the number of followers. However, Islam is currently the fastest-growing major religion in the world, suggesting that there may be an increase in Islamic followers in the coming years.
Probably Iran or Turkey.
They are called Shi'ites.