Dorlandt,
I've noticed that religions can never really start in their place of origin--probably because local people know the alleged prophet (and know him for the phony he is). So Buddhism, invented in Northern India, only took root in China. Jesus was spurned by the actual Jews who knew him and his alleged religion spread only after hitting Europe. Or Islam. Only something like 17% of all Muslims are Arabs. The Southeast Asian country of Indonesia is the world's largest Islamic nation.
It seems that exoticism has a lot to do with a religion's attractiveness.
Look at all the Brits in the mid-60's who followed the Beatles' cue and started chanting Hare Krishna. Many wore ridiculous Nehru jackets.
Half of the appeal was the perceived exotic nature of the religion's cultural backdrop.
The less we know, the more mysterious it seems--and the more susceptible we are to it.
So my theory: The next great religious revolutionary will be a Brazilian, but his religion won't take off until it hits Timbuktu.
P.S.--Regarding the effects of geography on a people, the poet Wallace Stevens wrote: "Man is the intelligence of his soil,
The sovereign ghost. As such, the Socrates
Of snails, musician of pears, principium
And lex. Sed quaeritur: is this same wig
Of things, this nincompated pedagogue,
Preceptor to the sea?"