and Allah said "And proclaim the pilgramage among men; they will come to thee on foot and on every kind of camel. Lean on account of Journeys through deep and distant mountain highways" Surah 22 ~ Al Hajj Part 27
Every Muslims proclaims the Testimony of Belief (Shahada)
"Ashhaduana laaha illaha-illalah, wa Ashhaduana Muhammad ara rasuulillah”
"I testify there is none worthy of worship except Allah (God) and I testify Muhammad is the last messenger of Allah (God)"
This simple fact makes Islam (Abrahamic ) (1.9 Billion and rising daily) the biggest singularly minded and practicing religion in the world. Muslims can be found in every country of this planet and form 25% of the world's population. The remaining 75% of the world's population is broken down in to 2900 religions, sects, cults, beliefs and faiths. The largest ones being:
Christianity - 2.1Billion (Abrahamic faith)
(This figure is made up of 2200 sects and cults, in the USA alone there 1800 breakway churches and 200 cults)
Hinduism : 900 million
Chinese traditional religion : 394 million
Buddhism : 376 million
Judaism : 14 million (Abrahamic )
Many Internet based statictical data sites were looked at and the data quoted above is at best approximate. Allah knows best what the actual numbers are.