I think that's not actually the point that was made by cma (and my paraphrased question was imprecise).
"Why would some point of existence or meaning lead specifically to Christianity?" presumes starting with no preferred solution: "existence has a meaning. Who discovered it?". It's much more interesting than "Christianity says existence has a meaning. What makes it right?"
> existence has a meaning. Who discovered it?
If you're looking for the Christian answer to this, it is: no one discovered it. The meaning of life is not discoverable knowledge. It is instead revealed by God.
That's right. The original question was:
> Why would some point of existence or meaning lead specifically to Christianity?
If you want to know "why is Christianity the source of meaning" that's an easier question to answer: it's because the omniscient, omnipotent and omnibenevolent Creator of the Universe loves you, and will give you everlasting life in paradise conditioned only on your acceptance of His sacrifice on the cross. Or something like that.