I hold to the 1689, so yes, I believe in the Sabbath. NCT is Dispensationalism-lite.I don't think our brother's comment was meant to be taken seriously.
But many TR micro-denominations major on several issues that really are not the main issues in a marriage. Are you going to drop a good woman over her beliefs on Psalms-only versus hymns? Good spousal candidates are in short supply in the US, after all. There is a nitpicky preciseness that can become very taxing in a marriage and this nitpickiness is often seen by some as a good trait instead of a bad trait. But I see it as a negative. Being flexible on some issues is a strength.
Practically, Sabbatarians and non-Sabbatarian Christians all worship at least once on Sunday. Pragmatically speaking, many Christians are pretty similar no matter if they are TR rigid Reformed-types or Southern Baptists. They go to church on Sunday, it is pretty simple.