The Apostles did not write down every critical point or you could take us to the definitive chapter on trinitarian theology.
The Apostles wrote down every critical point that God wanted us to have...And besides, God did not write on too many subjects, if any, that were completely defined in a singles chapter, or a single book...
Fact is, there is no definitive instruction on the Trinity in the scriptures...Your religion's guess on it's understanding of the Trinity is no better than some others...
The Apostles did not write down every critical point or you could take us to the definitive chapter on trinitarian theology.
Now wait a minute.....
Sure the apostles didn't write down EVERYTHING that happened, but the critical parts? Sure. God had written down what He knows we needed for salvation and growth in Him.
I find it incredibly ironic that a Catholic, of all people would criticize about making stuff up as you go when the Catholic church does that regularly.
A prime example is the bodily assumption of Mary. Their contention is that the Bible doesn't say that it DIDN'T happen, therefore is someone deemed a *church father* proposes it as doctrine, Catholics are expected to buy it because, after all, Scripture doesn't explicitly deny it.