I disagree. There were many practices and interpretations that differed in the Apostilic churches. They did not hold the same doctrines. This is especially clear if you look at the churches of Jerusalem, Corinth and Rome.We all accept that the Bible has Authority, but it cannot be the only Authority, because it is at the point of interpretation in truth that the Bible expresses its full Authority or it is nullified by wrongful interpretations.
But interpretation was not an issue because they were united in Christ and the differences were not about foundational doctrines.
We do not need to interpret most passages, as they speak for themselves. The problem is reading one's philosophy or worldview into Scripture.
That, BTW, is how the Catholic Church came to be, centuries after the New Testament Church had been established. When Rome mandated Christianity as their official religion Romans carried their paganism into the faith. Catholicism today is an amalgamation of Christianity and paganism.
We can see this in how they view the Lord's Supper. There are differences within Protestant denominations but no difference that divorces itself from Scripture (I do not mean Transubstantiation but the role of the rememberance). We certainly see this in its idolatry, and praying to people who have passed on.
But God's words are His words. They need application more than interpretation.