Protestant history starts with the reformation so you might need to dig a little deeper to learn about the Christian Church.
We did.
It's found right here....
https://www.biblegateway.com/passage/?search=Acts+1&version=ESV
and here....
http://legacy.biblegateway.com/passage/?search=ESV
Scroll down the the bottom and read the books from Romans through the first thee chapters of Revelation.
....”Protestant history starts with the reformation”....
My post was addressing the “split” in catholicism. I’m fully aware of the Protestant Reformation and why that came about but am not referencing that....rather catholism “split” itself....The division of the church between East and West is rooted deep in catholicism history. And yet catholics choose not to believe there were spilts among themselves nor “denominations/sects which branches from those splits.
Point being....they are not “one”.