Genesis 6 reflects a distortion of marriage. One improbable explanation of the "sons of God" is that angelic beings cohabited with human beings.
The first use of the word 'grace' in Scripture is in context with the rescuing of Noah, a preacher of righteousness from the line of Seth.
We do not need to excessively fear Satan, his demons, or the world, but we should fear and respect the One who has complete involvement in our lives.
From the beginning, God has set apart certain individuals, putting them through a sanctifying process, perfecting their character until they reflect His image.
Before the flood, Satan had attempted to corrupt mankind, probably through massive demonic possession. The same demonic threat will occur at the end-time.
Jesus Christ has full control of the church. Everything of consequence, including the development of our character, is engineered by Him.
We learn from our original parents that as soon as we sin, a stark change occurs throughout our nervous system, subjecting us to shame and fear.
Because the world is under the sway of the wicked one, if mankind were left to its own choices, the world would revert to the condition before the Flood.
God, following a pattern, routinely calls the lowly and weak to guard against pride. God will transform the weak of this world through His Holy Spirit.