- https://www.livingwaters.com/why-christianity/ seems to short-circuit back into "god-given rule"
- https://carm.org/atheism/why-believe-christianity-over-all-o... assumes the Bible as a historical source of truth
- http://www.gospeloutreach.net/whychristianity.html - quotes beauty not present in atheism, otherwise Bible as a historical source
- https://creation.com/why-christianity says Christianity correctly diagnoses a humanity's fault (moral inconsistency), and then declares it superior because of which solution it chooses
They don't seem to answer "why is Christianity the source of meaning", but rather "why choose Christianity as religion", which is a different question, so I might have misrepresented them. Either way, none of them seem very logically conclusive to me.
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.
"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?"
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.