[who_would_fardels_bear]

But didn't the Mongols ultimately convert to Islam and become the main force that 'evangelized' Islam to the rest of the world?

I think there is a two-edged sword in there somewhere.

[Harmless Teddy Bear]

No and yes.

When the empire broke up the four parts adopted the majority religion of the area they controlled.

However the Christians united with the mohammedans to fight the Golden Hoard. If they had not the mohammedans probably would have been wiped out.

A good lesson in being careful who you ally with.