As to purpose. Most of life is fake. But everyonce in a while, you might just find, there is something that IS meaningful, that isn't a waste of time. Not a blown up, exageratted purpose, but a real one. And christ and siddhartha aren't the only ones to find life's purpose. And the purpose they had (love, as far as I can discern) isn't the only real purpose in life. It's hard to explain, and I probably can't give an example--I can't right now.
I would agree with this. There are people, I think, who have purposes that are innate. This is not to say that they fulfill them--but they know them when they see them.
And perhaps the greatest moment in one's life is when one achieves--even in a small way--an innate purpose.