The Mongols had a benevolent attitude toward foreign religions,
or at least a policy of benign neglect.
Their belief in Shamanism notwithstanding, the Mongols determined
early on that aggressive imposition of their native religion
on their subjects would be counter-productive. Instead, they
sought to ingratiate themselves with the leading foreign clerics
in order to facilitate governance of the newly subjugated
territories. They even offered tax benefits to the clerics
of Buddhism, Islam, Daoism, and Nestorian Christianity in
order to win the support of those religions.
A quintessential Mongol view of religion may be found in
Marco Polo's writings. According to Marco Polo, Khubilai Khan
"There are prophets who are worshipped and to whom everybody
does reverence. The Christians say their god was Jesus Christ;
the Saracens, Mohammed; the Jews, Moses; and the idolaters
Sakamuni Borhan [that is, Sakiamuni Buddha, who was the first
god to the idolaters]; and I do honor and reverence to all
four, that is to him who is the greatest in heaven and more
true, and him I pray to help me."
For more on the Mongol rulers' policies of religious tolerance,
in China: Religion under Mongol Rule
in Mongol History: Chinggis Khan's Four Legacies