Catholics view Peter as the first Pope, although he certainly wasn't a celibate person, but married. They would do well I think to follow his example.
An important principle was given to John concerning different groups doing God's work. John wanted any acceptance of Jesus, any works, everything to fall under the direct authority of their group.
Mark 9:38
38 And John answered him, saying, Master, we saw one casting out devils in thy name, and he followeth not us: and we forbad him, because he followeth not us. But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me. For he that is not against us is on our part.
Luke chapter 9
49And John answered and said, Master, we saw one casting out devils in thy name; and we forbad him, because he followeth not with us. And Jesus said unto him, Forbid him not: for he that is not against us is for us.
Is this the interpretations that you objected to in independent church groups?
http://www.oldpaths.com/Archive/Davison/Roy/Allen/1940/062-flee.html
The problem with that interpretation is Babylon and those compared to it were always based on Non Judaic religions and even when the Jews were covered in sin, NEVER were they called Babylon as far as I recall, although they were called "******" such as the two sisters Ahollah, and Ahollibah. That refered to them embracing other non Judaic religious groups and religions within their own country, even at times sharing the temple grounds with them.
It's easy to see though why it could be applied to Catholic Church at times in it's history, since many descriptions line up with it. Seven hills she sits on, the church colors mentioned, but it's more than some religious compound. In description it's obviously an economic system also, especially concerned with the business environment, including those traders who used ships to arrive at it's shores. Walid Shoebat believes it refers to Arabia and makes some good arguments concerning it, but I think strains some points more than needed to make a good argument.
The book that was sealed in Daniel, for the time of the end, means either we will know the full meaning, understand what's already been written but "sealed" from our understanding till that day arrives, or it's an actual book that will be found at the proper time, probably from some cave like those at Qumran.
The level of corruption and type described in Rev 18 doesn't match up with the Catholic Church, although the killings, the murders, the religious persecutions at times in it's history can.
However, Satan is behind it and he NEVER gave the Jews his power, he ONLY gave it to those who were not God's people. His aim toward them was corruption first so he could have power then to oppress them, kill them, place them in captivity to a Babylon type power.
There is no reason to believe he'd change his tactics when it came to those who were Christians or professed Christ in any manner. He might make a lying covenant with them as a means to cause their fall, but NEVER share his power to them.
“Come out from among them and be separate, says the Lord. Do not touch what is unclean, and I will receive you” (2 Corinthians 6:17). Is almost a copy of Jeremiah and Isaiah prophecies to the Jews to leave Babylong at the time God provides a way for return to Israel. This means leaving out of a region, away from a totally false system that isn't based on Mosiacal concepts and for us today one that also isn't Christian in any form.
The only beast I know who hates both Jews and Christians is Islam. If so, which group? Sunni's or Shiites? I'm fairly certain the true meaning of it all will be apparent to us at the time. Till then a lot can be surmised, but definite conclusions I don't think can be reached.
Jesus implied that at some point we'd be able to see the day approaching for his return. Too many have thought they had that answer and been wrong. One day I suspect many will clearly understand the time is short, no doubt for believers at all. Till then... we watch...and wait.