First, all references to the cross (stauros) or crucify (stauroo) in Paul’s epistles, plus a couple seemingly related references. I’ve included notes where the relevant passage or word in question is attested as being in Marcion’s collection of Paul’s letters. No note means the passage is unattested (this doesn’t necessarily mean it wasn’t in Marcion, however - only certain passages are explicitly noted as being missing).
Gal 3:1: You foolish Galatians! Who has bewitched you? It was before your eyes that Jesus Christ was publicly exhibited as crucified!
-attested in Marcion
-a public display of Christ crucified
Gal 3:13: Christ redeemed us from the curse of the law by becoming a curse for us — for it is written, "Cursed is everyone who hangs on a tree"—
-attested in Marcion
-Christ ‘hanging on a tree’
Gal 5:11: But my friends, why am I still being persecuted if I am still preaching circumcision? In that case the offense of the cross has been removed.
-the ‘offence/scandal’ of the cross is associated with freedom from the Law for Gentiles
Gal 5:24: And those who belong to Christ Jesus have crucified the flesh with its passions and desires.
-attested in Marcion
-crucifixion as a metaphor for transcending one’s lower nature
Gal 6:12-14: It is those who want to make a good showing in the flesh that try to compel you to be circumcised—only that they may not be persecuted for the cross of Christ. Even the circumcised do not themselves obey the law, but they want you to be circumcised so that they may boast about your flesh. May I never boast of anything except the cross of our Lord Jesus Christ, by which the world has been crucified to me, and I to the world.
-attested in Marcion
-Paul and this world have metaphorically been crucified by Christ’s cross - the old relationship between the two has been made obsolete
1 Cor 1:17-18: For Christ did not send me to baptize but to proclaim the gospel, and not with eloquent wisdom, so that the cross of Christ might not be emptied of its power. For the message about the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
1 Cor 1:21-23: For since, in the wisdom of God, the world did not know God through wisdom, God decided, through the foolishness of our proclamation, to save those who believe. For Jews demand signs and Greeks desire wisdom, but we proclaim Christ crucified, a stumbling block to Jews and foolishness to Gentiles,
-attested in Marcion
-The ‘message of the cross’ is specifically called the power of God, for those with the eyes to see, so to say. According to Goulder this is foolish (‘a vulgar joke’ (NRSV note) or ’utter nonsense’ (SV)) to Jews because of the nature of salvation (not based on Jewish privilege, but faith). Paul contrasts his gospel to the Petrines’ gospel, based on ‘words of wisdom’ (i.e., Jewish interpretations of the Law). This suggests to me that the cross is uniquely Pauline - the other ‘gospel(s)’ don’t contain it. (only other reference to ‘cross/stauros’ in the NT epistles is in Hebrews) (Cf. Bernard Scott, who thinks it’s ‘utter nonsense’ because the idea of a crucified messiah would have been ridiculous and insulting for Jews - Doherty makes the same point, but adds that Paul isn’t referring to a human messiah)
2 Cor 13:4: For he was crucified in weakness (“appeared to have no power” - SV), but lives by the power of God. For we are weak in him, but in dealing with you we will live with him by the power of God.
-another linkage of the cross/crucifixion with power
-association between death and crucifixion (i.e., crucified in weakness, but LIVES by power)
Eph 2:16: and might reconcile both groups to God in one body through the cross, thus putting to death that hostility through it.
-another weak association between death and cross
Col 1:20 (attested in Marcion): and through him God was pleased to reconcile to himself all things, whether on earth or in heaven, by making peace through the blood of his cross.
Rom 3:25 (possibly omitted in Marcion): God presented him as a sacrifice of atonement, through faith in his blood. He did this to demonstrate his justice, because in his forbearance he had left the sins committed beforehand unpunished--
Rom 5:9: Much more then, being now justified by his blood, we shall be saved from wrath through him.
1 Cor 10:16 (attested in Marcion): Is not the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ?
1 Cor 11:25, 27 (attested in Marcion): In the same way, after supper he took the cup, saying, "This cup is the new covenant in my blood; do this, whenever you drink it, in remembrance of me." … Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.
Eph 1:7: In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God's grace
Eph 2:13 (attested in Marcion): But now in Christ Jesus you who once were far away have been brought near through the blood of Christ.
-association between blood and cross (and other references to Christ’s blood)
Col 2:14: erasing the record that stood against us with its legal demands. He set this aside, nailing it to the cross.
-1st half attested in Marcion
-not Jesus, but the legal record, is put on the cross
Phil 2:8: he humbled himself and became obedient to the point of death — even death on a cross.
-attested in Marcion
-explicit link between death and the cross
Phil 3:18: For many live as enemies of the cross of Christ; I have often told you of them, and now I tell you even with tears.
-SV reads “many have adopted a way of life that is opposed to everything the cross … stands for.” i.e., they live an ‘earthly’ existence, valuing those things the satisfy their lowest natures (food, sex, ambition, etc.)
A few times, Paul refers to normal death, but he also uses it metaphorically, i.e., dying to the old, living in the new. Here are the death references with Jesus as the subject:
Gal 2:21: "I do not nullify the grace of God, for if righteousness comes through the Law, then Christ died needlessly."
1 Cor 8:11: So this weak brother, for whom Christ died, is destroyed by your knowledge.
1 Cor 15:3 (attested in Marcion): For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,
2 Cor 5:14-15: For Christ's love compels us, because we are convinced that one died for all, and therefore all died. And he died for all, that those who live should no longer live for themselves but for him who died for them and was raised again.
Rom 5:6-8 (attested in Marcion): You see, at just the right time, when we were still powerless, Christ died for the ungodly. Very rarely will anyone die for a righteous man, though for a good man someone might possibly dare to die. But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.
Rom 6:9-10: For we know that since Christ was raised from the dead, he cannot die again; death no longer has mastery over him. The death he died, he died to sin once for all; but the life he lives, he lives to God.
Rom 8:34 (possibly omitted in Marcion): Who is he that condemns? Christ Jesus, who died--more than that, who was raised to life--is at the right hand of God and is also interceding for us.
Rom 14:7-9: For none of us lives to himself alone and none of us dies to himself alone. If we live, we live to the Lord; and if we die, we die to the Lord. So, whether we live or die, we belong to the Lord. For this very reason, Christ died and returned to life so that he might be the Lord of both the dead and the living.
Rom 14:15: For if because of food your brother is hurt, you are no longer walking according to love. Do not destroy with your food him for whom Christ died.
1 Thess 4:14: For since we believe that Jesus died and rose again, even so, through Jesus, God will bring with him those who have died.
1 Thess 5:10 (possibly omitted in Marcion): who died for us, so that whether we are awake or asleep, we will live together with Him.
Next, references to triumph:
2 Cor 2:14: But thanks be to God, who in Christ always leads us in triumphal procession, and through us spreads in every place the fragrance that comes from knowing him.
-Paul is led by God in triumph, but as captive or victor? The text is ambiguous. (many translations either have Paul leading the triumph, or have him as the captive)
Col 2:15: He [Christ] disarmed the rulers and authorities [i.e., demonic forces who control the planet, not earthly rulers] and made a public example of them, triumphing over them in it.
-Here Christ is triumphant
And allusions to triumphal processions:
1 Thess 4:15-17: Christ’s coming (i.e. parousia) in triumph, to the sound of trumpets (Peter Ellis, in “Seven Pauline Letters”, sees connections with Josephus’ description of Titus’ victorious entry into Antioch - Chrysostom made a similar connection to ‘clarify’ this passage in Paul, showing “there was no great difficulty in understanding the analogy of triumphal procession”)
If Christ was displayed on a tropaeum, that’s interesting, because a triumph displayed the vanquished’s booty on a tree or tropaeum: e.g., the defeated foe’s armour. So why display Christ as conquered?
The cross is associated with death and new life, so maybe it ties in with the way Paul uses these words elsewhere, and what it means to live an earthly as opposed to spiritual life. The cross as a symbol of God’s triumph over poneros (corrupting influence of sin/archons that direct human affairs) and the reality of an alternative.
Christ on a tropaeum is a triumphal display showing the power of God (1 Cor 1:18) to offer redemption to ALL (not just Jews; Gal 2:21, 5:11) who live a life “in Christ” (i.e., those who do the Work to achieve a higher level of being, to die to the ‘world’ and gain new ‘life’). It’s not a matter of magical ethnic or religious privilege. The old way is 'conquered', showing the new way.