The difference between Christianity and Catholicism

[Byrd]

So, there was no church before Constantine, before Rome took it over, Christianity didn’t exist, really? 
is that what you are implying? 

I am Not a Pentecostal or charismatic so not my job to defend them but there are charismatic Roman Catholics
https://www.ccr.org.au/about-ccr/what-is...ic-renewal
https://www.ministrymagazine.org/archive...ecoctalism
And they follow the Nicene creed, meaning they would be accepted

There was no formal church, no.  No formal creed, no formal set of books that everyone used.  There was a lot of fierce infighting over whose rules should be followed, but the consensus of the majority of the groups of believers is the practice that became the Catholic Church.

Minority groups like the Essenes did not have many of their ideas adopted.  Other minority groups were eliminated (often in warfare.)

But the original faith that swept the world was that of the Catholic Church.  Protestantism is an evolution from that, but not an evolution that took place by going back to original manuscripts and trying to find what the original practices were.  So, yes, it's not what the originators would have recognized.