Well, if you go by a belief system akin to Jack Chick, then the RCC is the driving force behind the anti-christ and the great tribulation on the earth.
I agree with TriunUnity on this one. There will probably be millions of “Christians” deceived at that time. It won’t be because they are pretending to be Christian, in my opinion. It will be because most Christians, at least here in the USA know the same amount of scripture as anyone who went to sunday school as a child, but never read another passage as an adult. Christians today simply do not know the scriptures. I say this because I was as guilty as anyone else once I came to the faith. At first, I was on fire and read the bible all the time, but it is easy to back off it and let your pastor(Catholic or protestant) feed you the little bit you get every week and simply not think about it again until the next sunday.
That is how a charismatic person can start a new “feel good” church next week and within 5 years, have a 10,000 member congregation. Most churches today are light on sin, heavy on “whatever makes you happy”.