The beast is the roman empire and it has one leader: A political leader. The political leader is supported by the false prophet who will be the religious leader: The man of sin, the antichrist. He will come from the jewish people and they will accept him as the false messiah.
Maybe you mean this:
For the mystery of iniquity doth already work... 2. Thess 2
Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time. 1. John 2
The roman catholic church does not match the definition of the antichrist according to John, because they basicly don't deny Jesus Christ as the Son of God. But of course it is a heresy and not the gospel what is teached there.
This matches the RCC much better:
And unto the angel of the church in Thyatira write; These things saith the Son of God, who hath his eyes like unto a flame of fire, and his feet are like fine brass; I know thy works, and charity, and service, and faith, and thy patience, and thy works; and the last to be more than the first. Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols. And I gave her space to repent of her fornication; and she repented not. Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds. And I will kill her children with death; and all the churches shall know that I am he which searcheth the reins and hearts: and I will give unto every one of you according to your works.
But unto you I say, and unto the rest in Thyatira, as many as have not this doctrine, and which have not known the depths of Satan, as they speak; I will put upon you none other burden. But that which ye have already hold fast till I come. And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations: And he shall rule them with a rod of iron; as the vessels of a potter shall they be broken to shivers: even as I received of my Father. And I will give him the morning star. He that hath an ear, let him hear what the Spirit saith unto the churches.
Revelation 2
You mistake history with things to come. It's impossible that we are already in revelation 4.