What you say does not make much sense. When Jesus came to Nazareth as a grown man, this is what His neighbours said about Him:
“Isn’t this the carpenter’s son? Isn’t his mother’s name Mary, and aren’t his brothers James, Joseph, Simon and Judas?" (NIV Matthew 13:54).
And a few verses later: "And they took offense at him. But Jesus said to them, “A prophet is not without honor except in his own town and in his own home.”" (NIV Matthew 13:57)
So clearly, Mary – Jesus's mother – was not kept from being stoned because her neighbours believed Jesus was the Son of God, see Luke 1:26-38 for what Mary was foretold by the angel about her birth of Jesus as the Son of God.
Before Jesus was born, Joseph married Mary: "When Joseph woke up, he did what the angel of the Lord had commanded him and took Mary home as his wife" (NIV Luke 1:24).
Jesus became known as our Saviour because of His words, acts, death and resurrection, not because the neighbours thought He was so spectacular when He was born.
There is no evidence for this except what is told in the Bible. Which is the whole point, you are one of those irrational people who are holding onto an irrational asset (Religion). That asset has value to you since others are holding the same asset, if there were no others in the world who believed in the Bible then you wouldn't believe either. So shorting Bible belief could seem rational, it is bound to die sooner or later, but likely it wont die in the next 10 years.
And just to illustrate, a rational belief is belief in something like newtons laws of physics. Although they aren't 100% correct they are still useful for solving many problems so they will likely survive as long as humanity exists. The main difference is that the laws of physics has value even if you are the only person believing in them. Similarly Amazon stock has value even if nobody else wants to buy them. But bitcoins just like the Bible has no value if others doesn't believe in them.
As to "rational belief", isn't that an oxymoron? There is 'rational knowledge'. Belief is precisely regarding matters where reason remains mute. Your beliefs and your knowledge are the full content of your world reality.
And if it's akin to religion or a well known brand, it could be easily cloneable but not easily adoptable. I can make a leather handbag or carbonated beverage right now, but unless I slap a Chanel or Coca Cola logo on it, it's not likely to be in demand.
We have the tendency to approach this from a rational perspective - "it's not a currency or store of value", "what about Tether", etc. But I can think of plenty of examples where the name itself is powerful enough. I'm not willing to bet that Christianity (or any major religion) will collapse in the near future. Slow decline, maybe.
Of course, maybe there's only like a tiny minority of true believers, a couple price manipulating whales, some smoke and mirror organizations, and everyone else is a Robin Hood speculator. I don't have the numbers on that.