Melchizedek is an impressive priest.  He blesses Abraham, which implies that even father Abraham is inferior to him.  This is an order that would be described as hieros, rather than the usual term used in the New Testament, presbuteros, and coms not by descent from Levi, but is an order that allows sacrifice to be offered from the rising of the sun to its setting.

All of the Bible leads to the conclusion that God will come to be with us, but sin separates us from God. Sometimes we are tempted to downplay our sin, but that downplays God's holiness. We see God's holiness overpower many people in the Bible.

We also see that the Messiah is prophesied to have a priestly role, who will finally end sin by sacrifice of Himself, and that He would come in what we call now the first century AD. The Messiah, however, need not be a Levitical priest, but as we know, is a priest forever of the order of Melchizedek.

We can be confident that God will save us if we call on His name, but salvation is a process, and is not a magical proclamation that assures us Heaven no matter how wicked we are in this life. We must rejoice in our hope and in our sufferings, and know that to the extent that we cooperate with God's grace, we are rewarded in the next life.

Throughout all of biblical history, God has rewarded those who hope in Him. There are those who will deny the action of God in their lives, even as the Hebrews ignored the explicit miracles they saw in the times of the Exodus, but those who have a fear of the Lord or who have an expectation the Lord's grace in the world are praised in the Bible.

In 2 Sam 7, David seeks to make a house for the Lord, but God declares that He will establish a house for Israel, a promise fulfilled in Christ.

Isaiah 7-12 concerns a prophecy to King Ahaz. A virgin or young woman will bear a son, and call him Immanuel, or God with us. This may have been a double prophecy, with multiple meanings, but it is clear that by the time of the translation of the Septuagint, the woman was considered to be a virgin. This is a promised heir to the throne of David.