How is it that you claim we are not in a state of corruption by the failure of the first Adam? Adam and Eve our first parents ate from the Tree of the Knowledge of Good and Evil and as a result, we are now barred from the Tree of Life and Gan Eden. All of the pain and suffering of this world, is due to that initial mishap or mistake made by our first parents. The Ramchal in Derech Hashem, speaks of the corruption of creation and how the suffering of the Tzadick Gadol, the High Righteous One, who is superior to other righteous people (hence the word "Gadol"), is able to purge creation of all of its corruption from the very beginning of creation, through his suffering.
Do you actually deny the fact that in the Bible the first Adam's disobedience caused a cosmic catastrophe? Adam named the animals, all life, giving them their natures. So Adam being the head of creation, created in the image of God, corrupted that life and this physical world, through his disobedience. We need a new head, a new leader for our souls, and that is the Messiah. The Jew who split time, Yehoshua Ben Yoseph. He goes to the heart of the matter, his redemption begins at the soul level, before it translates into politics, or a social order. The corrupted soul or heart has to be reconnected to God. The mission of the savior or second Adam, is to restore creation, similar to what the Ramchal says about the Tzadick Gadol, who purifies creation with his suffering.
Salvation is the rebirth of the fallen, disconnected soul to YHWH God. A type of spiritual resurrection, through faith or a binding or tying of the heart to Messiah's heart. We trust Yehoshua, the salvation of YHWH, and He leads us into the promise land. The land of milk and honey is Gan Eden. We move from Egypt, the wilderness, into eternity. We are reborn in YHWH through His Messiah, Yehoshua (The Salvation Of YHWH - That's what Yehoshua means). Through one man, the first Adam, we are consigned, forced into, the grave, without recourse. The second Adam, the Messiah, defeats death and sparks the resurrection through His righteous life and suffering. He lays down His life for all of humanity hence He is the Jew Who Split Time (BC - AD). The Glory Of Israel, the Lion of Judah, the one the nations seek. He unites humanity in faith. Emunah.
You can continue keeping Shaboos, all of the feast days..etc, which are fulfilled in Yehoshua. You can continue being Jewish. The Messiah will actually infuse your observance with the Holy Spirit and you will become the Tabernacle, the Temple of YHWH. The Holy Spirit or Ruach HaKodesh, will fill you, and grant you the gifts and power to serve Him and keep your heavenly Father's commandments. Yehoshua will save you from death and through you He will save many.