It is written that we are to test all things and hold fast to the good. The Bereans were noble because they tested everything against the scriptures. The one doctrine that can't be tested today is the one that needs it the most.

https://firstcenturychristiani....ty.net/problems-with

Problems With the Trinity? - First Century Christianity
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Problems With the Trinity? - First Century Christianity

The Trinity is such a widely accepted doctrine that it is strange to see it challenged. There are many problems with the Trinity doctrine.