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In my humble opinion the flood of Noah was more than just a large amount of water to rid the world of sin, as the entire climate changed, our whole creation changed, why? Lets look to scripture for the correct answer as to why God brought the flood and then why only Noah and his family survived it. Genesis 6:1 is speaking of normal men and women multiplying on earth. Genesis 6:2 is speaking of the breeding of the sons of God and normal women. In the old testament the phrase "sons of God" never refers to believers, this changes later in the new testament book of Luke. But now "sons of God" means angels (Bene HaElohim) which refers to a direct creation of God, exclusively to angels in the Septuragint. Reference Job 1:6 and Job 2 and then Job 38:7 And "the daughters of men" (benoth adam) these are the daughters of both Adam and Cain which produced a corrupted hybrid. Genesis 6:2 Genesis 6:4 This hybrid was called Nepilim "the fallen ones" another phrase "the mighty ones" (HaGibborim) translates from the Greek Septuagint as gigantes "earth-born" from the Greek gigas. Later translated into English as giants, they appeared to have been large. Scripture is telling us that all the flesh, the very gene pool on earth was corrupted by the mischief of these hybrids. Genesis 6:9-12 But Noah was a just man and perfect in his generations and Noah walked with God. Scripture is telling us that Noah was distinctive in that his genealogy was perfect and not corrupted or blemished. I submit the flood was God doing a major house cleaning on the creation to rid it of this gene pool corruption caused by these fallen angels. Reference 2 Peter 2:4-5 and then Jude 6-7 In the Lord"s freedom and mercy............warrior on
Frankly speaking I do not know the answer. But, of course, I have my opinion, that makes a sense for me. The flood demonstrates the characteristics of sin: 1. Though the judgement by flood was not as terrible as the last judgement would be, yet it demonstrates it. 2. Noah was found by God as to be the only righteous man among all other men, yet after the flood his descendent were no better than the ones that were destroyed by the flood. This demonstrated that sin is much much deeper problem in human being than we can imagine. Even the best man of the world can not produce a righteous generation. 3. The flood demonstrated that sin by itself is a destructive force, that is, it is suicidal for human being, if not checked by God. God's sadness after the flood (Gen. 8:21-22) shows this. Even before the flood God's heart was grieved by the sin of men (Gen. 6:5-7). 4. The judgement by flood is a kind of parable of the final judgement (2 Pet. 3:6--7,10-12), a warning to all. In fact all pains and calamities, whether physical, mental, social, or spiritual, are to serve as warning to the eternal pain in hell. 5. As Jesus has said in Jn. 5:39,46 that Moses wrote of Him and that his writings testify Jesus, so the flood leads us to Jesus the true righteous man. The new humanity born in Jesus only will escape the final judgement. Only in Jesus we have that breakage from sin that provides the true righteousness that will stand the last judgement. So the flood was not for the eradication of sin, but to reveal the true nature of sin.
Perhaps because God (in His eternal omniscience) would have known that, even though the Flood would not eradicate sin from the earth (since Noah -- although described as righteous -- was still a fallen human being, as were his descendants), if He did not act when He did, and in the manner that He did, the extent and severity of human sin would grow to such a degree in the time between the Flood and the beginning of the New Testament (or even before) that it would make impossible the timing or circumstances (or even the occurring) of the promised Messiah's birth, life, death, and resurrection, and the manner in which they would fulfill (through the actions of humans, some of whom -- such as Caesar Augustus (Luke 2:1) -- did not even know the God of Israel) all the prophecies concerning the Messiah.
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