Rather Large Historical Error

[Meneldil]

The whole 'Mongols are more friendly toward christians than toward muslims' is actually mostly a myth created by western (catholic) christians, who rarely had to fight against said Mongols.

It has been enabled by several facts, including but not limited to:
- Mongols were actually pretty tolerant toward Christianity, just like they were with pretty much any religion.
- Mongols destroyed many of the most important Muslim Emirates/Kingdoms/States.
- Mongols and Christians (Crusader States, France, etc.) planned to ally against Egypt at various time, but it never actually happened.
- A part of the Mongol elite adopted nestorianism.
- The whole Priest John mythos.

What Catholics conveniently forgot was that:
- Mongols were as tolerant of muslim as they were of christians, as long as they behaved correctly.
- Mongols destroyed many Christian states (the Russian principalties), and would have tried to conquer Europe without some bad luck.
- A part of the Mongol elite adopted Islam as well.

In the end, they must have been somewhat disappointed since most of the Mongols states that emerged after the fall of the empire adopted Islam and not Christianism.
I think the only one that did not were China and the siberian horde.

France for example, tried to plan up some alliance at several point. Some king whose name I forgot sent a message to the Khan, asking him for an official alliance. The Khan apparently liked the idea, but died before the message arrived. His mother/daughter/wife/whatever then received it and promptly sent it back asking the french King to become a vassal.
Later on, another french king formed an alliance with Tamerlan. Wasn't a big deal, since Tamerlan never threatened western Europe, but it probably must have been a slap in the face of other european monarchs.

[Quintus.JC]

Edward longshanks allied with the Mongols during the ninth Crusades, and made joint attacks on Aleppo and some middle eastern cities during that time.

[Pannonian]

In the early days of the Mongol era, they didn't define themselves as Muslims and Christians as the western world was wont to, but many of them, including many of the ruling class, did follow Christian and Muslim faiths. Instead, as directed by Chinggis, they identified themselves as Mongols over any other identity. When the influence of Chinggis was wearing off, this was also discarded, most significantly when Berke, the (Muslim) Khan of the Golden Horde got peed off with Hulegu's treatment of Baghdad, and allied with the Mamelukes against the Ilkhanate.

Nonetheless, both the Muslim ruler of the Golden Horde and the Christian ruler of the Ilkhanate acknowledged the nominal overlordship of Khubilai, who was neither.