Shared ground
Paul’s main move is clear: he calls the Corinthians to get away from idolatry (v.14), and then he supports that call by reasoning from a meal they already know (vv.15–17). The structure matters: the command is not left hanging; it is argued for.
The argument depends on the idea that shared eating can create real bonds. Paul points to “the cup of blessing” and “the bread we break” and says they are a real in what they represent—Christ’s blood and body (v.16). Then he draws a community conclusion: because there is “one” loaf, the many are “one bread” and “one body” (v.17).
Where interpretation differs
How strong “participation” is. Some read “participation” mainly as relational and communal: the cup and bread publicly identify the group with Christ and with each other, without implying a change in the elements themselves. Others read Paul’s wording as stronger: the shared cup and bread involve a deeper sharing in Christ’s life and benefits in a way that is more than a reminder.
What “flee idolatry” covers in meal settings. Some take Paul to be targeting meals that are plainly tied to a deity or temple worship (a religious act). Others extend it to any meal setting that effectively signals allegiance to other gods, even if it looks like “just food” socially.
“One bread”: symbol only or practice-linked. Some read “one bread” as a straightforward metaphor for unity. Others think Paul’s point leans on an actual practice of sharing one loaf, making the physical “one loaf” part of the argument, not just an illustration.
Why the disagreement exists
Paul uses dense, familiar meal-language with rhetorical questions. He does not stop to define how the cup and bread relate to Christ’s “blood” and “body,” so readers infer the strength of the connection from the word “participation” and from the way Paul uses communal eating to argue about non-neutral religious involvement.
What this passage clearly contributes
Explicitly, the text claims that idolatry is serious enough to require separation (v.14), and that Paul expects his readers to follow a reasoned argument (v.15). It also explicitly links the shared cup and bread with participation in Christ’s blood and body (v.16). From that, Paul explicitly infers community unity: many participants become “one bread” and “one body” because they share in the one loaf (v.17). Theological inferences about how Christ is present or exactly which meal settings count as idolatry go beyond what is spelled out here, but Paul’s core point is clear: eating practices can express allegiance and create real spiritual and communal ties.