Well, I grew up believing that Jesus lived, died, and rose again. I grew up with a whole bunch of other beliefs too. But what do we really need to know?
Belief in the resurrection of Jesus is a central hallmark of what it means to be Christian. Belief in what it means is something else entirely.
I believe in that event mainly as something that I grew up with so much that I have difficulty letting go. I grew up with this notion of a God that cares enough about the world to make a difference, and the story of Jesus as the ultimate example of just how dramatic of a difference a single act of God could make in the course of human history.
And so, the life, death, and resurrection becomes a dominant metaphor for me to understand the process of spiritual growth - I live what I believe, I die to that which is inappropriate (whether the “sin” of Christianity or the “attachment” of Buddhism - the words don’t matter, IMHO), and I am resurrected in a new understanding of my self, my role in the world, and the convictions that I must bring to bear on how to be a servant of God.
To me, this is all that I value about “the meaning” of Christ’s existance - and everything else winds up being something that either follows from Christ’s teachings (as we can best ascertain through honest scholarly research done with integrity), or is something that we just have to let God inform us about.