UN's global diversity is reflected in the workplace. Muslims, few in those days anyway, need not apply. They already dominated management. Mercifully, things are different today.
Ability counts more than ethnic or religious background in the business workplace.
Still not, however, at the highest reaches of government. No surprise really. A president, even one without a real mandate, is entitled to select people who roughly share his philosophy and with whom he may expect to work comfortably. At the United Nations, the rule has always been that the best qualified candidate gets the job, and politics don't count. Many years ago, Dag Hammarskjold managed it, refusing to name an unqualified Soviet time server to his first policy-making cabinet and finally persuading Moscow to release an official of his own selection whom he deemed worthy of the UN position.