Part 1:
The New Testament's atonement doctrine cannot be explained on the basis of the Tanakh alone. Although it does draw from this well, particularly in the Paschal imagery St. Paul employs (1 Cor 5:7) or the Yom Kippur mysticism of Hebrews, the martyrdom theology which developed during the Maccabean period (4 Maccabees 6:27-28, 4 Maccabees 17:20-22) should prove to be the basis for this theology.
Although the notion of a righteous person dying for the sins of the nation is arguably found in the Tanakh (Isaiah 52:13-53:12), this theology gets significantly more development during the Maccabean period when Judeans who sided with the Torah-keeping faction suffered at the hands of the Seleucids (2 Maccabees 7). This is also about the time when the idea of a final resurrection first begins appearing in the literature (Daniel 12:2, 2 Maccabees 7:14) and elaborations about the afterlife and atonement in general (2 Maccabees 12:39-45).
With this in mind, one cannot help but read Romans 5:12-21 in this light where God's wrath against the gentiles is collectively appeased (so long as they have faith) because Jesus's act of righteousness satisfies God's wrath. In this way, Paul could be seen as holding to a kind of satisfaction theory of atonement (not to be confused with the more precise satisfaction theory of atonement laid down in latter centuries by theologians like Anselm).
The New Testament's atonement doctrine cannot be explained on the basis of the Tanakh alone. Although it does draw from this well, particularly in the Paschal imagery St. Paul employs (1 Cor 5:7) or the Yom Kippur mysticism of Hebrews, the martyrdom theology which developed during the Maccabean period (4 Maccabees 6:27-28, 4 Maccabees 17:20-22) should prove to be the basis for this theology.
Although the notion of a righteous person dying for the sins of the nation is arguably found in the Tanakh (Isaiah 52:13-53:12), this theology gets significantly more development during the Maccabean period when Judeans who sided with the Torah-keeping faction suffered at the hands of the Seleucids (2 Maccabees 7). This is also about the time when the idea of a final resurrection first begins appearing in the literature (Daniel 12:2, 2 Maccabees 7:14) and elaborations about the afterlife and atonement in general (2 Maccabees 12:39-45).
With this in mind, one cannot help but read Romans 5:12-21 in this light where God's wrath against the gentiles is collectively appeased (so long as they have faith) because Jesus's act of righteousness satisfies God's wrath. In this way, Paul could be seen as holding to a kind of satisfaction theory of atonement (not to be confused with the more precise satisfaction theory of atonement laid down in latter centuries by theologians like Anselm).