That’s an excellent point.
http://www.lib.utexas.edu/maps/world_maps/muslim_distribution.jpg
White Paper on Islamic Bimetallic Currency
Gold and silver restore social equilibrium
The dinar and the dirham can be the world currency of all free people
http://www.sharelynx.com/papers/WhitePaperonIslamicBimetallicCurrency.php
Quran Al Fatah 48
Muhammad is the Messenger of Allah ; and those with him are forceful against the disbelievers, merciful among themselves. You see them bowing and prostrating [in prayer], seeking bounty from Allah and [His] pleasure. Their mark is on their faces from the trace of prostration. That is their description in the Torah. And their description in the Gospel is as a plant which produces its offshoots and strengthens them so they grow firm and stand upon their stalks, delighting the sowers - so that Allah may enrage by them the disbelievers. Allah has promised those who believe and do righteous deeds among them forgiveness and a great reward.
You get marked in the forehead by bowing to Mecca
There's lot's more...