Kind of my point. They weren't mostly or primarily Buddhist at the time of their great conquests. Buddhism, Christianity, Islam, Manichaeism and probably Taoism and other religions were practiced freely by Mongols. This is especially because the Mongols largely absorbed rather than destroying other nomadic tribes. There were a great many more "Mongols" by the time of Kublai than when Genghis started his career. Of course the assimilated groups all brought their own religious practices with them.
The Mongol rulers respected and supported all religions, up to the point when the western and central khanates began converting to Islam.
No one said that they were did they? So what is your point? Even today I doubt that all Mongols practice Buddhism. Even in Tibet large numbers of Tibetans are not Buddhists or at least not serious practitioners.
But I did prove that Buddhism was very strong in Mongolia long before you claim it was. When the ruler himself becomes a Buddhist and most of the ruling class is as well and their interest becomes a major influence (all quotes from my previous source) then you can't dismiss it as insignificant much less non-existent as you claimed. I see you have changed your story about that now so as to try and maintain some veracity to your position.