An excellent and extensive source of Church history from the Catholic Encyclopedia:
http://www.newadvent.org/cathen/03158a.htm
Almost anything you wanna know, it's in there.
And if there's unity, it's going to be official, with no barriers from either side and full participation and consent. You can't be a catholic is you're not already one and/or not convert. Simple.
Would partaking in practices of the Catholic Church like Eucharist, the Sacraments, certain types of prayer be considered taking part in RCC religion? I agree that Protestants wouldn't be official Catholics but he is very instrumental in pushing what would be technically a global religion. Green sabbaths? With slight religious undertones. Check out the ecumenical movement, if you get a chance. It shows all the religions also uniting in purpose to serve out the pope's message. To see things that were written about and seemed a bit farfetched to even my SDA self, coming to pass, it's strengthened my confidence in what the Bible says.
The pope has been meeting with the ceos of various social media platforms and they have expressed a dedication to "spreading his message ". Recently the US gave away rights to the Internet. He's basically connecting with every platform.
@Mingus thank you for reading! There's much more. The climate change agreement has things that would really affect our day to day life. I am sda but I say that loosely. I've recently been restudying. I've also come across articles where it's been discussed that dissenters should be fined, and jailed (though this is not an official declaration). Since the agreement is international, going against the legislation would deem you a terrorist. It's tying up very nicely into a one world system. Trump is electing people that will gladly make this a Fascist type of government with no qualms. But also a very strong candidate in the eyes of the evangelists/christian base. I think his name is.... (Kenneth Copeland) recently did an article saying he has a direct means of communication to Trump. Says he could deliver a message from God to Trump and he feels that Trump would listen. I don't know if he will play a role but it's interesting.
I'll be going to bed soon but just wanted to throw additional information out there if you're interested.
I also observe Friday sundown to Saturday sundown as Sabbath (according to the scripture that says "from evening to evening...."
I've been getting away from the holidays though that's not a formal doctrine for us. Just seeing the history of various days, I'm not really feeling them anymore.
I post these not to bash anyone's specific beliefs, but I do believe we are definitely in a serious time.