Unity In Truth "Sanctify them by the truth; your word is truth." (John 17:17)
Within Christianity there is a lot of pressure to ignore doctrine and to unite with churches which clearly have false teachings. Some people say that we all love the same Jesus so we should put aside our differences and simply look at what we have in common; basically they are saying that believing in Jesus is all that matters. At first, this would seem to be a good thing because Jesus prayed for all believers asking, "that all of them may be one, Father, just as you are in me and I am in you" (John 17:21). However, when we take a closer look at what Jesus was saying, we see that a few verses earlier He said, "Sanctify them by the truth; your word is truth" (John 17:17). In these verses, Jesus is asking God to sanctify (make holy and separate) all believers in the truth of His Word. So, when Jesus was asking God to make us all one, He was asking that we be united in the truth of the Bible. God does not want us to unite with those who hold false teaching and this fact is made very plain in Rom. 16:17: "I urge you, brothers, to watch out for those who cause divisions and put obstacles in your way that are contrary to the teaching you have learned. Keep away from them." Rather than unite with those who have false teaching, this verse urges us to keep away from them. God does not want unity at the expense of truth.
Love one another As already noted, if we believe that a church has false teaching then we should not unite with them. However, when we refuse to unite we are often told that we are unloving. After all, we are told, Jesus said to love even our enemies. If we don't think this through then we may come to feel that we are unloving and have a guilt trip which could lead us to being persuaded to unite, against our better judgment. The fact of the matter is, eternal hell waits for those who follow false religions so we should not unite with them. Real love is keeping separate and showing them their error in the hope that they too will repent and be saved. Eph. 4:12, 15 tell us that God wants us to "be built up until we all reach unity in the faith" and that we should be "speaking the truth in love." Real love and unity can only come through a common bond of truth, not a mixture of truth and error. In Phil. 1:9-10, Paul wrote: "And this is my prayer: that your love may abound more and more in knowledge and depth of insight, so that you may be able to discern what is best and may be pure and blameless until the day of Christ." Paul is telling us that our love, purity and discernment grow with our knowledge and insight into God's word. Uniting with error is not loving, pure or discerning.
The Ecumenical Movement The Ecumenical Movement is a Roman Catholic plan to unite all Christian denominations (as well as all the world's cults and religions) into a one world religion, headed by the Pope. Many people are being drawn into this, but born again believers should not be part of it as Roman Catholicism is a false gospel. Catholicism teaches that the forgiveness of sins and salvation can only be obtained in their church, through the Eucharist sacrifice in the Mass. They curse anyone who says otherwise. As a matter of fact, they have placed over one hundred curses on Protestants and anyone else who disagrees with their doctrines. Rather than love those who oppose them, they curse.
The woman of Revelation 17 Rev. 17 tells us about a woman riding a Beast during the end times. She is called Babylon The Great, The Mother Of Prostitutes. The following points from Rev. 17 are given to help us identify this woman. The woman:
Commits adultery with the kings of the earth (v.2) – She has unholy relationships with world leaders.
Dresses in purple and scarlet (v.4) – Like Rome's bishops and cardinals.
Adorns herself with gold, precious stones and pearls (v.4) - She is extremely rich.
Has a golden cup in her hand (v.4) – Like the golden cup of the Mass.
Is drunk with the blood of the saints (v.6) – Like during the inquisitions etc.
Sits on seven hills (v.9) – Like the city of Rome.
If this is not enough evidence to identify the woman as being the Roman Catholic Church then God leaves us with no doubt when, in Rev. 17:18, He told John that "The woman you saw is the great city that rules over the kings of the earth." When John wrote Revelation, Rome was the city that ruled over the kings of the earth so it is very plain that the Roman Catholic Church is the woman called Babylon The Great, The Mother Of Prostitutes.
It may be argued that Rev. 17 is history but this argument is false as Rev. 17:12, 16 tell us that ten kings help the Beast destroy the prostitute and this event is not found in any history book. It is yet to come and Rev. 18 continues on to prophesy that it will happen. Rev 18:2: "With a mighty voice he shouted: 'Fallen! Fallen is Babylon the Great! She has become a home for demons and a haunt for every evil spirit, a haunt for every unclean and detestable bird.'" Rome is clearly identified as a demonic institution which will be destroyed and for this reason God commands His people to come out of her. Rev 18:4: "Then I heard another voice from heaven say: 'Come out of her, my people, so that you will not share in her sins, so that you will not receive any of her plagues; for her sins are piled up to heaven, and God has remembered her crimes.'" This is a very strong warning to separate or suffer the consequences.
Finally How can born again believers unite with a church that God says is demonic and will be destroyed? 2 Cor. 6:14 asks believers, "what fellowship can light have with darkness?" The obvious answer is, "None!" Rather than join the Ecumenical Movement, believers need to separate otherwise they will share in her sins and receive her plagues. 1 Cor. 10:21 tells believers, "You cannot drink the cup of the Lord and the cup of demons too; you cannot have a part in both the Lord's table and the table of demons." In the same way that a Muslim convert must separate from Islam, born again believers must separate from Roman Catholicism and the Ecumenical Movement as God says, "come out from them and be separate, says the Lord. Touch no unclean thing, and I will receive you" (2 Cor. 6:17).
There are two excellent videos on YouTube which expose Catholicism in more depth: They are called A Woman Rides The Beast and A Lamp In The Dark.