[marshmallow]

How do you know this??? How do you know they returned to Jerusalem??? Is that a tradition they passed on from one generation to the next??? We know this because that tradition was recorded as scripture by the apostle Paul...And preserved by God for a couple of millenniums so far...You don't have an argument...

It wasn't "recorded as Scripture by the Apostle Paul". Nothing was "Scripture" when it was "recorded". It became Scripture, subsequently.

The essential point here is the indisputable fact that Paul and Barnabas returned to Jerusalem to resolve a pastoral and theological issue, with the "apostles and ancients" without recourse to a then non-existent New Testament. They could do so by virtue of the authority bestowed on them by Jesus himself. That authority is still to be found in the successors of the Apostles.

You have no argument.

[Iscool]

It wasn't "recorded as Scripture by the Apostle Paul". Nothing was "Scripture" when it was "recorded". It became Scripture, subsequently.

It became scripture when??? It was scripture to Peter...So we know it was scripture before 70 A.D...

That authority is still to be found in the successors of the Apostles.

There is no apostolic authority by successors...That fable was created by the guy who made up the Isidorian Decretals which are known forgeries...