The true sons of God make it their business to walk with God. When the sons of God in Genesis 6:2 took wives of the daughters of men, they brought about a confusion and an attack on the godly seed from whom Christ and the salvation of the world would come.
Romans 8:14 says, "But as many as are led by the Spirit of God, they are the sons of God." Obviously the sons of God in Noah's time were not led by the Spirit of God which places them into a different category than being disobedient sons of God.
Men, I think the same problem occurs with the sons of God in today's world. If we are not being led by the Spirit of God, then the question is, what spirit is leading us? Most likely the spirit of this world which turns us into sons of disobedience.
Ephesians 2:2 says "Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air the spirit that now worketh in the children of disobedience."
Ephesians 5:6 says, "Let no man deceive you with vain words: for because of these things cometh the wrath of God upon the children of disobedience." And again in Colossians 3:6, "For which things' sake the wrath of God cometh on the children of disobedience."
Genesis 6:9 tells us that "Noah was a just man and perfect in his generations, and Noah WALKED WITH GOD." There was no compromise with the godly lineage which was important for the coming seed of Christ. This is also important for the sons of God today for He still wants to manifest His image through us.
Be encouraged.
Colin Campbell