I'm kind of confused by this: it's probably my own ineptitude in comprehension (and I am quite stick at the moment), so if I'm off just ignore me.
So what you're asking is "what kind of faith can syncreatize with Abrahamic religions the way Buddhism had in the past", but being accepting of Buddhism as a possible medium for this? Is this correct? Also, I might add: though it is true that many Hindus revere Gautma Buddha and likewise many Buddhists revere Hindu gods, it is quite hilarious if you're versed in their metaphysics. Essentially, there could be no larger differences between them here: Buddhism completely and utterly rejects Hindu assertions on the universe, with a central metaphysical tenant in Buddhism being the antithesis of the Hindu atman, the Buddhist anatta or 'anatman'. Since I don't except either as an explanation in my own religious life it doesn't do me much harm, but it is funny to think that some individuals either can reconcile these concepts or hold distinct, opposing truths as equally possible explanations for our existence
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I'll take Buddhism and Christianity on for size. In Christianity, the issue of reincarnation doesn't stand to me as the biggest issue nor in Buddhism: what really stands out is the existence of a Creator God with an interest in the welfare of a people, for Christians the non-ending of suffering and sin with Jesus' death, and as well reconciling some of the religious and metaphysical symbolism used in both religions. I wouldn't attempt to do that here since you probably wouldn't like the result, but as before, I'd suggest accepting that the result of this would be sort of a "Mormon" like off-growth of either religion (it would require a rewriting of both canons). If what you truly desire though is this passive non-invasive theological syncreatism that doens't create a new offshoot in either religion but merely balances them both, to solve the issue of reincarnation in Christianity is not difficult. Heaven and nirvana could simply get merged into being one and the same, and rather than 'fire and brimstone', the negative Christian afterlife is merely rebirth into this world which is suffering etc.
I don't actually think Buddhism meshes well with Christianity without a rewrite though I've been quite repetitive on this point. Nonetheless, depending on where this is interpreted, this may not be a problem. I think if this religion emerges in India or East Asia you'll see a much more 'Buddhist-centric' interpretation of the religion, with the opposite in Europe. A 'true' median syncreatization probably wouldn't happen in a place without significant Buddhist and Christian interaction before emerging: though a place where that may indeed happen might be in Central Asia/Russia- which would be very intriguing.
So what you're asking is "what kind of faith can syncreatize with Abrahamic religions the way Buddhism had in the past", but being accepting of Buddhism as a possible medium for this? Is this correct? Also, I might add: though it is true that many Hindus revere Gautma Buddha and likewise many Buddhists revere Hindu gods, it is quite hilarious if you're versed in their metaphysics. Essentially, there could be no larger differences between them here: Buddhism completely and utterly rejects Hindu assertions on the universe, with a central metaphysical tenant in Buddhism being the antithesis of the Hindu atman, the Buddhist anatta or 'anatman'. Since I don't except either as an explanation in my own religious life it doesn't do me much harm, but it is funny to think that some individuals either can reconcile these concepts or hold distinct, opposing truths as equally possible explanations for our existence
I'll take Buddhism and Christianity on for size. In Christianity, the issue of reincarnation doesn't stand to me as the biggest issue nor in Buddhism: what really stands out is the existence of a Creator God with an interest in the welfare of a people, for Christians the non-ending of suffering and sin with Jesus' death, and as well reconciling some of the religious and metaphysical symbolism used in both religions. I wouldn't attempt to do that here since you probably wouldn't like the result, but as before, I'd suggest accepting that the result of this would be sort of a "Mormon" like off-growth of either religion (it would require a rewriting of both canons). If what you truly desire though is this passive non-invasive theological syncreatism that doens't create a new offshoot in either religion but merely balances them both, to solve the issue of reincarnation in Christianity is not difficult. Heaven and nirvana could simply get merged into being one and the same, and rather than 'fire and brimstone', the negative Christian afterlife is merely rebirth into this world which is suffering etc.
I don't actually think Buddhism meshes well with Christianity without a rewrite though I've been quite repetitive on this point. Nonetheless, depending on where this is interpreted, this may not be a problem. I think if this religion emerges in India or East Asia you'll see a much more 'Buddhist-centric' interpretation of the religion, with the opposite in Europe. A 'true' median syncreatization probably wouldn't happen in a place without significant Buddhist and Christian interaction before emerging: though a place where that may indeed happen might be in Central Asia/Russia- which would be very intriguing.
@Midas : To be clearer, I'm actually not focusing to specifically make Buddhism co-attachable with Abrahamic faiths or any other kinds of strict monotheism, just a religion that can co-attach with those monotheist faiths the way Buddhism had with many polytheistic traditions, but certainly I don't mind making Buddhism into one. And as far as I know about Chinese folk religion, it's actually just as monotheistic as Hinduism, with The Heaven as the higher being, but there are also many minor and not-so-minor deities as well. And I do know that Hinduism and Buddhism are able to and did syncretized. So I view syncretism of Buddhism with Chinese mythology as in kind with the other case with Hinduism.
As for how to reconcile Buddhism with Abrahamic faiths, I think that what basically needs to be done is to reconcile the concept of Buddhist enlightenment with Abrahamic concept of The Highness of The One God, which is easily doable without major tweaks. What's trickier is the issue of reincarnation, which require one of either side to follow another, either the Buddhist side abandoning it or the Abrahamic side adopting it. The later will drive the resulted syncretism closer to either side, instead of a relatively nonchallant binding of the both packages, which is what I'm trying to get here.