Buddhism teaches that our universe is a "formless (infinite and all pervading) field of liberation" comprised of perfect wisdom and love (compassion). Does that sound so different from God?
That's exactly what I mean, C: To you, a formless field of liberation comprised of perfect wisdom and love sounds like God; to me, it sounds like the absense of God (albeit an extremely attractive absense of God). To me, God is a being; assuming that I'm reading you correctly, to the Buddhist God is not a being, but rather more of a state.
If there was really consistency between Christianity and Buddhism in this regard, shouldn't the issue be a lot more clear? For example, in Judaism and in Islam, and to my knowledge (which, again, is limited) Brahman Hinduism-- in these and other religions, God is portrayed as a being. But that's my perception from my culture (and Christianity is indeed a culture). Your perception is different. Each is valid. But that's not to say that there could (or even should) be a resolution to this question.
Personally, I'm content with allowing everyone to make up their own minds as to who they believe is a prophet, and who they believe was not a prophet. However, in this way there will never really be a general consensus as to who was or was not sent from God, will there? I don't believe that Buddha was a prophet, but I'm not going to waltz into a monastery and criticize all the monks for misleading the world with their false beliefs, because to those monks their beliefs are perfectly true; otherwise, they wouldn't have chosen to devote their lives to them, yeah?
My original take was that a prophet from another religion could only be considered a prophet if their teachings are consistent with those of one's own religion. This is an inherently ethnocentric (I think the term applies here; religiocentric or culturocentric seem strange) point of view, because it assumes that one's own religion (or at least personal beliefs) is the one to measure by. I admit that it's biased, but I don't think there's anything wrong with that as long as one is aware that it's biased.