Please re-read the posting in question. Each quote is cited. If they weren't, I would not post them.
You assume that the Scriptures are a how-to manual. They are not. They were epistles written to specific churches to deal with specific problems. They are not intended to constitute a systematic treatment of Christian doctrine and practice.
Then what are you doing here? If the Scriptures aren't your source of Theology, why don't you post that and move on? Seriously, you post that you don't look to the scriptures for your faith, then you post this:
Yeah. That's why in 1Corinthians, Paul assumes that the Corinthians were already gathering on the first day of the week.
???????
Because that's not what I said. What I said is that the Scriptures cannot be interpreted as though they were a how-to manual. It leads to eisegesis.