The difference between Christianity and Catholicism

[Maxmars]

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

I always thought the whole idea of "Catholic" was meant to directly imply that everyone can be accepted in the community, with only some exigent circumstances being excepted... "unwillingness" being chief among them.

Not sure if the idea of being charismatic somehow alters the individual's faith.  Isn't that more of an overt decision about behavior in worshipping?  Why would they be considered somehow 'excluded?'

By the way, I didn't get the impression that Byrd was saying Christianity (or perhaps Catholicism) didn't exist until after Constantine's Nicene Council... maybe I'm confused.