1 pet 4:3-6 in it's context —"For the time of life which is past is enough for us to have worked out the will of the nations, having gone on in lasciviousness, lusts, excess of wine, parties, carousings, and abominable idolatries. In these things they are surprised, that you are not running with them into the same excess of riot, blaspheming. But they shall give account to Him who is ready to judge the living and the dead. For to this end the gospel was preached also to the dead, that they might be judged according to men in the flesh, but live according to God in the Spirit."
In the context, above we see Paul is discussing unsaved people now (in his time, and of course it applies to our time as well), who taunt Christians for not living like them anymore. It was this same type of people in the "world" in Noah's time, who mocked as he built his ark to escape the coming judgment, and all soon perished. It was not those people in Noah's time who were being preached to by Christ, (unless you see Christ preaching to them through Noah) but just a comparison of the wickedness.
The point is, Christ's message is being offered to these people in the world today, enslaved in the prison of sin and condemnation. This passage even seems to be a reference to (fulfilment of) the messianic prophecy in Isaiah 42:1-7 "Behold My Servant, whom I uphold; My Elect, in whom My soul delights. I have put My Spirit on Him; He shall bring out judgment to the Gentiles. He shall not fail nor be discouraged until He has set judgment in the earth; and the coasts shall wait for His law. So says God, the LORD He who created the heavens and stretched them out, spreading out the earth and its offspring; He who gives breath to the people on it and spirit to those who walk in it. I the LORD have called You in righteousness, and will hold Your hand, and will keep You, and give You for a covenant of the people, for a Light to the Gentiles; to open the blind eyes, to bring out the prisoners from the prison, those who sit in darkness out of the prison house".
This is even recognized in chain references. Sin is many times over referenced as both "prison" and "death".
In the context, above we see Paul is discussing unsaved people now (in his time, and of course it applies to our time as well), who taunt Christians for not living like them anymore. It was this same type of people in the "world" in Noah's time, who mocked as he built his ark to escape the coming judgment, and all soon perished. It was not those people in Noah's time who were being preached to by Christ, (unless you see Christ preaching to them through Noah) but just a comparison of the wickedness.
The point is, Christ's message is being offered to these people in the world today, enslaved in the prison of sin and condemnation. This passage even seems to be a reference to (fulfilment of) the messianic prophecy in Isaiah 42:1-7 "Behold My Servant, whom I uphold; My Elect, in whom My soul delights. I have put My Spirit on Him; He shall bring out judgment to the Gentiles. He shall not fail nor be discouraged until He has set judgment in the earth; and the coasts shall wait for His law. So says God, the LORD He who created the heavens and stretched them out, spreading out the earth and its offspring; He who gives breath to the people on it and spirit to those who walk in it. I the LORD have called You in righteousness, and will hold Your hand, and will keep You, and give You for a covenant of the people, for a Light to the Gentiles; to open the blind eyes, to bring out the prisoners from the prison, those who sit in darkness out of the prison house".
This is even recognized in chain references. Sin is many times over referenced as both "prison" and "death".