I have no idea what you mean by "post-modern".
In the case of a parable or metaphor, whose opinion is the one correct interpretation? Observing that there are more than one interpretations that are consistent with scripture is not "post-modern." For each interpretations, people will feel compelled differently.
I don't agree with your analysis of 1 Cor 11:19
Let's look at the TPT:
"I’ve been told many times that when you meet as a congregation, divisions and cliques emerge—and to some extent, this doesn’t surprise me. Differences of opinion are unavoidable, yet they will reveal which ones among you truly have God’s approval.[a] When all of your house churches[b] gather as one church family, you are not really properly celebrating the Lord’s Supper.[c]" - 1 Cor 11:18-20 TPT
Footnotes
In the case of a parable or metaphor, whose opinion is the one correct interpretation? Observing that there are more than one interpretations that are consistent with scripture is not "post-modern." For each interpretations, people will feel compelled differently.
I don't agree with your analysis of 1 Cor 11:19
Let's look at the TPT:
"I’ve been told many times that when you meet as a congregation, divisions and cliques emerge—and to some extent, this doesn’t surprise me. Differences of opinion are unavoidable, yet they will reveal which ones among you truly have God’s approval.[a] When all of your house churches[b] gather as one church family, you are not really properly celebrating the Lord’s Supper.[c]" - 1 Cor 11:18-20 TPT
Footnotes
- 11:19 Differences of opinion between believers expose our hearts. Mature ones will overlook offenses and faults in order to maintain the precious unity of the body of Christ. Immature ones will cause splits, divisions, and cliques around their respective opinions. The ones whom God approves are those whose hearts remain pure in spite of petty differences.
- 11:20 Implied both in the text and by the cultural context of the day.
- 11:20 Paul is implying that it is the Lord’s Supper, not merely a meal for favored ones. Jesus is hosting the meal for the benefit of all every time we gather for communion.