The ark which saved Noah and his family from the Flood is a beautiful type of Christ as the only way of salvation. As the Flood of God's judgment on sin came upon the earth in Noah's day, so the flood of God's judgment against sin came upon Christ at the cross. As the ark was battered by the awesome storms of the Flood, and then rested on Mount Ararat, so the Lord Jesus bore the terrible penalty for our sins and now rests from His finished work. As Noah and his family believed God and were saved from physical death solely through the ark, so we who trust in Christ are saved from sin's penalty of spiritual death through Christ alone. As the animals were saved by entering the ark with Noah, so animals can be saved as well as people.
Types are illustrations.
We were not letting the illustration determine doctrine. In many ways the life of Isaac is a type of Christ. In Genesis 24, the type continues with Abraham sending his servant to a far country to select a bride for Isaac. Just as Abraham's unnamed servant shared the good news about his master's son and heir with Rebekah, so the Holy Spirit is presently sharing the good news of Jesus Christ and calling the Church out of this world as a bride for Christ, the only and beloved Son of God. However, even if Christ's Return was not divinely intended to be a part of this spiritual picture, we have not determined the doctrine of His Return from this type.