Around 1600 million Muslims; per PEW Forum study as of October 2009
By country the highest number of adherents are located in Indonesia. By region Islam is most concentrated in north Africa and the middle east.
Ismaili
believer (a person who believes in or follows some theory or religion or philosophy)
There is no Gideonite faith. If you are referring to Gideon of the Bible he was Jewish. There is a group of Christians that call themselves Gideons. They are a group of lay people usually...