A Sequel to the New Testament? Year 70AD
If there was ever an event that could be seen as a sequel to the New Testament (and without which, it doesn't make proper sense), it would be the fall of Jerusalem and its Jewish Temple of animal sacrifice in the year 70AD. Jesus of Nazareth had promised 40 years prior (Matthew 24) that its destruction was inevitable, despite its immense prestige throughout the ancient world at the time. Even his disciples had called Jesus' attention to the Temple in complete awe of its majesty, especially after being newly (and fantastically) renovated by the Romans.
But despite the awe and wonder it provoked throughout the known world, Jesus knew the corruption and decadence that presided over it, and how that corruption had already sealed its fate. For the disciples, though, that such a wonder of architecture (not to mention, a political tightrope) could ever come to ruin seemed inconceivable. In the same way that in more recent history people simply could not compute that The Titanic could ever sink, so also, Jesus' notion of how the Temple would eventually come to ruin would have seemed to them impossible. But he was adamant: no matter its seeming indestructibility, it would find its demise anyway.
In fact, when Jesus said to his disciples: "If anyone says to this mountain, be removed and be cast into the sea, he shall have what he says" (Mark 11:23), the "mountain" he referred to was the immense Temple that stood before him (and all the corruption and compromise that presided over it). So his point was that, if you aligned yourself with the inevitability of its doom ahead of time, you would be more likely get through such a terrible time.