“Quite removed” in terms of time.
It means that the church failed to destroy records about how the stuff they peddle wasn’t written anywhere near the events they supposedly describe. You’re supposed to spend years studying the book upon threat of physical violence or death until you reach a point where you’re too invested in the mythos to bother questioning it. You’re supposed to NOT study all the figures that we have written records of that predate the jesus myth:



A MITM doesn’t require decrypting. It just requires telling a convincing enough lie to each side of a conversation that they think they’re talking to the other party. Then you end up encrypting to their key which they can just read. That’s different from breaking the encryption.
No, and none of the state actors who do that kind of stuff will ever tell you. Watch The Imitation Game for a good/bad time and some context.
If you had a break for the modern crypto schemes and published it right now you would shut down all digital commerce, a lot of the spy traffic if not most of it1, and nothing could be started back up again until everything was redone from scratch. Best hope would be that the post quantum algorithms2 the cryptographers have aren’t succeptible to whatever you did to break the existing algorithms. It’d take a bit to get the software implementations and keys in place, etc. The hardware stuff would take longer.