Manichaeism was a very widespread religion from Iran to China, almost rivaling Christianity at one point of time. I had been recently reading about this religion and was surprised how "close" to Buddhism it was, especially after adopting many Buddhist ideas and terms in China (just like how Taoism was doing). The founder of White Lotus sect in China against the Qing dynasty was also a follower of Mani.
This scholar here has done a pretty detailed research upon it (which I am yet to study properly):http://www.google.co.in/url?sa=t&rct=j& ... mk&cad=rja
Upon researching further about it, I came to know that there is also a Monijiao Buddhist sect in China:http://monijiao.org/
They do everything like normal Buddhists, which is pretty surprising for a religion originating in Iran!