FastEST track ‘Buddhism’ is Zen. The master hits you on the head and, hey presto, you ‘see’, you are enligntened.!! It is just as Christain says, as far as I can see.
The ‘non-oral transmission’ that Sybe mentions refers to Bodhidharma, who introduced ‘buddhism’ when he travelled to China. That in time gave rise to the various Mahāyāna schools in China, Korea and Japan.
Have devas ever been known to come and listen to Mahavira? Were Vens. Moggallana and Sariputta formely not his disciples?
Anyway, I do not see any value in going this to any lenght.