What if the Romans hadn't killed Jesus?

[Lek]

2 “Do you see all these great buildings?” replied Jesus. “Not one stone here will be left on another; every one will be thrown down.”
--Mark 13

The funny thing about this "prophecy" is that it literally came true...but not in 70. The ruins of the city were left as burned out hulks except for what the Romans leveled to build a new base camp for the 10th Legion which was stationed in the city.

It came true in the aftermath of Hadrian's urban renewal project c 135 AD when the ruins were leveled and the new Roman town of Aelia Capitolina was built on the site. Not so coincidentally, it is this time period when xtianity seems to get going. Marcion, for example, was active around 140 AD and a generation later was being denounced by the proto-orthodox for "heresy."

But the story seems to be second century... not first.

The prophecy may have been completed in 135 AD, but the process begain in 70 AD. The meaningful event would be the destruction of Jerusalem and the temple, ending the Jewish sacrificial worship system. Jesus' prophecy was to be fufilled within the lifetime of the current generation. If it was fufilled in 135 AD, the writers after that time wouldn't include that prophecy because it would show that it was false. And saying that Matthew and Luke were written after 135 AD is quite a stretch. Christianity started getting going shortly after Jesus' death, with the apostles converting thousands in a day. Though Marcion was influential in establishing the canon of scripture, that doesn't attest to when the scriptures were written.