The Buddha's discourses give us mainly religious information. That is their one notable feature. The Buddha's discourses were never intended to provide us with accurate, verifiable historical information. That Siddhartha awakened becoming a Buddha is, strictly, a religious claim that cannot be historically proven (keep in mind that 'religious' means relating to that which is acknowledged as ultimate reality).
Said again, a person who studies Buddhist history has no access to Siddhartha’s nirvana. It should be obvious that history cannot describe the content of Siddhartha’s enlightenment whereby he became a Buddha.
On the other hand, a person who studies the religious information set forth in the Buddhist canon is more likely to become convinced that Siddhartha awakened to the unconditioned-element (asaṅkhata-dhātu) as might others who follow Buddhism’s religious path.
Several days ago, I asked myself where, exactly, does secular Buddhism fit in with this? It doesn’t seem all that religious to me. If anything, it is the gradual conversion of the religious realm into the secular world.
Next, there is no secular Buddhism embedded somewhere in the Buddhist canon. All of Buddhism rests upon the awakening of Siddhartha. But we know from the cannon that the Buddha made a distinction between secular people, namely, puthujjanas, meaning, the worldly, and his disciples, looking down on the former.
Then it dawned on me how might secular Buddhism work. I came up with this: use the historical to undermine the religious. As mentioned earlier, history has no access to Siddhartha’s nirvana. How might a historical-critical perspective even engage with nirvana itself?
Nirvana, to be sure, is a transcendent experience which is wholly religious and personal (S., pratyātman). History has no means by which to enter it as mentioned earlier. But for the secular Buddhist, if Buddhism can be historicized, that is, made dependent on history as a basis of explaining Buddhism, then it logically has no need of the strictly religious for explaining Buddhism.
Laying this aside for a moment, Christianity succeeded to some degree in making Christianity seem dependent on history. A historical record became the support for one’s faith even with the resurrection. Hence, the New Testament has to be taken literally and less spiritually (i.e., gnostic).
But Buddhism does not go here since it rests pretty much upon a religious framework. Buddhism’s history is better understood in a mythological light. Mythology is the use of language to explain an inexplicable spiritual world, that is, a world that cannot be accessed by the senses but, nevertheless, is real lending itself to metaphorical language; the uplifting of our mind to spiritual things. In the words of J.R.R. Tolkien “myths are largely made of ‘truth’.” In other words, myths must rest upon a religious foundation.
But let us not forget, that the secular wants none of this! The senses cannot go here much less even the emotions but still mythology has a great impact upon the human spirit. Just look at J.R.R. Tolkien’s Lord of the Rings and the three films Peter Jackson directed which gave us a cinematic glimpse into Lord of the Rings. Even the earlier Star Wars films contained some mythology which the fans loved (the last three Star Wars films have been, largely, an attempt to destroy the mythological content, reducing Star Wars to a feminist narrative). Mythology becomes successful when its foundation becomes largely truth in the example of the film, Matrix (1999) which appears to have a gnostic theogony behind it (I wonder of the Wachowskis read The Apocryphon of John?).