If one understands the Multiverse as the (finite) number of all possible histories contained in God’s mind, then the Multiverse is rather a logical consequence of acknowledging God’s omniscience and human free will.
A particular consequence of this is that God can produce two real worlds running parallel during a time, so that in one world things occur according to the ordinary patterns we are used to, and in the other world deviating from these patterns. This seems to be what happened in the so called “Miracle of Fatima” on 13th October 1917, according to the reports of witnesses. In this perspective this “Miracle” can even be considered an experimental test upholding the Multiverse.
Such an explanation could be applied to the Flood in Genesis 6-9:
Noah, his family and the people who perished, they all can be supposed living in the region of the antediluvian Sumer cities and having experienced the Flood according to the Genesis narrative, while the rest of the planet was populated by creatures that remained safe and became accountable only at the end of the Flood (see the thread “My theory about the Flood”). Additionally at the end of the Flood no geological evidence of the miracle remains. We believe that it occurred on the basis of the narratives in the Old and New Testament, as we believe in the resurrection of Jesus Christ on the basis of the witnesses of his disciples and not because of any archeological vestiges.
It may be interesting to discuss whether a similar explanation could also be applied to the Exodus of the Israelites with the Crossing of the Read See and the 40 years journey in the wilderness.