The parable of the mustard see appears in Matthew 13 together with the parables of the sower, the weeds, and the yeast. Jesus uses all of them to explain the growth of the Kingdom of Heaven by comparison with processes where very little things (seeds, yeast) give rise to big transformations. In this context the point of the comparison is that the growth of the Kingdom of Heaven although imperceptible is as real and huge a transformation as that seeds undergo or yeast produces.
By introducing the Flood into his End Times prophecy Jesus is teaching to us (and not only to those who were listening him on the spot) two things:
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The End Times and the Flood are both extraordinary miraculous events.
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The End Times will really happen, as really as the Flood happened.
This is “a clear indication in the Bible”, since, as Brad very well claims:
As already said, according to @JohnWalton (see this YouTube IP video) “the Flood narrative works as a Recreation narrative”, and this means that from the Flood universal order emerges.
None knows what is inspired in the Bible better than the Incarnate Word of God: Can you indicate Bible verses where Jesus speaks about “the six days of creation”?
If not, then we have not to worry for an interpretation beyond ordinary natural phenomena.
Apparently YECs do not realize that for Christians the authority to ascertain what is inspired in the Bible is Jesus Christ. But you would fall into the same error if you deny that Jesus Christ is teaching to us that the End Times will be as real an event as the Flood was.
So we are compelled to search for a coherent explanation integrating the fact that Noah’s Flood was an extraordinary miraculous event, and the fact that no geological trace of such a catastrophe can be found in our ordinary world.
And lo and behold quantum physics today is telling us that parallel worlds are possible: What more can you ask for?
In one world Noah and all Image Bearers around him perceived the Flood as it is narrated in Genesis. In the parallel world (our world) nothing extraordinary happened, and thus there is no need for God to remove any trace: Just like in the Miracle of the Sun in Fatima on October 13th, 1917.