Is it approval in God's sight to buy and sell in the Church after the sunday servicer

[Barney]

I personally think that a lot of fuss is being made about nothing.
The early church met from house to house and not in flashy church buildings.

Jesus and the disciples regularly met at the Temple, one of the fanciest buildings in the world, at the time. Until the Temple was destroyed, Christian converts form Judaism continued to preach at the Temple.

In the NT, Christians sometimes met in the "Upper Room" which necessarily was part of a big, if not fancy, building.

Pssst, Christianity was illegal. With that fact in mind, and without scripture to support you, why would you think there's something doctrinal about avoiding church buildings?

Before we worry about buying and selling goods in that building, maybe we should address some of the non Christian practices and pagan traditions the church indulges in.
The fertility goddess Ishtar and the god Saturnalia, along with other demonic powers are celebrated without anyone questioning their true meanings. Names might be changed, but the demons behind them still get entry passes to church at these events in their honour

Utter and complete nonsense.