Did you write it, or are you quoting it?
I am paraphrasing myself so I guess the best answer is “both”.
There was no “Christianity of Jesus Christ and his early followers”. Christianity was born after the crucifixion of Jesus, and his followers (as distinct from the followers of St. Paul) did not call themselves “Christians” - nor did anyone else call them that.
I admit I have no idea what early “Christians” called themselves. Even if I did, I would use the word because most readers here will know what it means.
The Eastern Orthodox Church only split from the Roman Catholic Church in 1054 C.E.
The Byzantine and Roman factions had been growing apart since the 5th Century. The “Great Schism” was the divorce but the estrangement began hundreds of years before. Again here, using “Eastern Orthodox” and "Roman Catholic’ in this context was just a shorthand I figured everyone would understand.
No, the Roman Catholic and Eastern Orthodox Churches had not “moved away from plain meaning to allegorical interpretation of Scripture” by the seventh century. They did not yet exist as separate churches. And varying interpretations of the Christian “New Testament” documents had nothing to do with the rise of the middle classes.
While the two were not officially separate, there were substantial difference of opinion. IIRC, Original Sin, the Immaculate Conception, and the provenance of the Holy Spirit were some of the biggies.
No such events as you refer to in your third paragraph gave birth to science. The first scientists were in ancient Greece. Thales (7th - 6th century B.C.E.) is called “the Father of Science”.
OK, I’ll give you that point. I am an engineer not a historian and tend to view science through a modern lens. Thales may be called the “Father of Science” but, AFAIK (I am far from a expert on him), he never addressed the problem that incorrect knowledge can survive just as easily as correct knowledge. It wasn’t until the 16th Century that men like Galileo and his contemporaries began seriously questioning the truth of what was passed down and investigated to discover what the real situation was. That’s why, without minimizing earlier contributions, I date the beginning of modern science to the period that also gave rise to the Reformation.
There were many Christian cults from the 1st. century onwards for hundreds of years until Rome succeeded - for a while - in imposing orthodoxy. The differences of opinion as to what was Christian “truth” led to many schisms, wars, and persecutions from the reign of Constantine to modern times.
And if there is any sense in your last paragraph, it eludes me.