What is the percentage of Muslims in the Arabian Peninsula?

The world's human population is currently 6.8 billion. Numerous surveys, censuses and estimates place the number of Muslims at between 1.2 billion and 1.57 billion.

From these figures, one can easily figure that the percentage of people that are Muslim is between 17.647% and 23.088%.

Direct estimates of percentages normally provide figures between 20% and 25%, with some going below this range as above. About one quarter (25%) of total world population are Muslims; according to Pew Forum study as of October 2009. In other Words, one out of every four or five people.