In Matthew, Jesus speaks of bringing division to the earth:
“Do not think that I came to bring peace on earth. I did not come to bring peace but a sword. For I have come to ‘set a man against his father, a daughter against her mother, and a daughter-in-law against her mother-in-law’; and ‘a man’s enemies will be those of his own household” (Matthew 10:34-36).
UNITY IN THE BODY OF CHRIST
We must look at all passages from the Word in context. As born-again believers in Jesus, we are to be united. The Word of God is non-negotiable. God tells us from His Word, exactly what we are to believe. He also speaks about us loving one another, so that the world would know that we are His.
Sin separates man from God. God’s desire was to reconcile men and women to Himself. He sent His only Son, Jesus Christ, to earth; born of the virgin Mary, and ultimately to shed His blood on the Cross for the forgiveness of our sins. We must repent of our sins, and call upon His name to be saved. That is what the Word tells us.
“For the Scripture says, “Whoever believes on Him will not be put to shame.” For there is no distinction between Jew and Greek, for the same Lord over all is rich to all who call upon Him. For “whoever calls on the name of the Lord shall be saved” (Romans 10:11-13).
We must be united in our belief that the only way of Salvation is through repenting and believing the Gospel of Jesus Christ, and Him as our Lord and Savior. There is no other way to be saved.
There are many preachers attempting to unite with religions and even denominations, who have veered away from the truth found in the Word of God. It alarms me when a pastor or preacher, who has taught from the Word soundly for many years, suddenly breaks away from the Bible, and gives his own opinions about matters. This begins the slippery slope syndrome which inevitably happens when a teacher of the Word does not hold up the Word of God as inerrant and infallible.
There is a movement now to “Return to Rome” within the Evangelical Church. How are we to align ourselves with the RCC, when they are a works based religion? I have called the RCC a cult, and I will continue to refer to them this way.
“Is ecumenism biblical? Should a Christian be involved in the ecumenical movement?
“First of all, Are those we are joining with truly Christians in the biblical sense of the word? Many people and organizations in America and the world “name the Name of Jesus Christ” and even state He is Lord and Savior and yet clearly reject what the Bible says about Him. Obvious examples of this are Mormons and Jehovah’s Witnesses. They will say they are followers of Jesus Christ and are Christian and yet deny with vehemence what the Bible declares concerning Christ’s nature and work. A not-so-obvious example comes in the form of liberal Christianity. Liberal Christianity is found in almost every denomination in the United States and, although it may seem very Christian, usually liberal Christians reject several essential biblical truths such as the inspiration and authority of the Bible (2 Timothy 3:16), Jesus as the only Savior of the entire world (John 14:6, 1 Timothy 2:5), and salvation as God’s free gift to those who believe apart from good works (Romans 3:24, 28; Galatians 2:16; Ephesians 2:8-9).
As seen with the publication of Evangelicals and Catholics Together, there is a major emphasis in our day on ecumenical unity among Evangelicals and Roman Catholics. Those who promote such unity state that both are Christian and both are viable, God-honoring systems of faith. But clearly the substantial differences between the two groups render ECT a ridiculous document. Biblical Christianity and Roman Catholicism are two different religions that practice and believe different things about how one is saved, the authority of the Bible, the priesthood of believers, the nature of man, the work of Christ on the cross, etc. The list of irreconcilable differences between what the Bible says and what the Roman Catholic Church says makes any joint mission between the two absolutely impossible. Those who deny this are not being true to what they say they believe, no matter which side they are on. Any Catholic who is serious about his faith will deny what a serious evangelical Christian believes and vice-versa.” 
I believe that Satan puts the idea of peace between all nations and religions into the hearts of unbelievers, to get their minds off of God and onto themselves. There is a movement within the Southern Baptist Church, to align themselves to Islam, spreading the lie that Christians serve and worship the same God as Muslims. I have written several articles on this subject, and have shown by the Word how this is impossible.
Please see these articles to understand why Allah and the God of the Bible are not the same.
The God of the Bible and Allah
The Real Jesus is NOT Isa from the Qu’ran
The U.N. is associated with the United Religions Initiative. This organization is pure evil, and its agenda is having a one world religion. Pope Francis is closely associated with this group. I call the URI “Ecumenicalism on steroids.” We will see more and more from this group as time progresses.
“There is a way that seems right to a man,
But its end is the way of death” (Proverbs 14:12).
JESUS IS THE ONLY WAY
“Jesus said to him, “I am the way, the truth, and the life. No one comes to the Father except through Me” (John 14:6).
These words of Jesus are so clear. There is no room for discussion or a different interpretation. He is the only way to heaven.
Jesus came to pay our debt for sin; a debt that we could never pay. The world knows that born-again believers talk about repenting of sin. They do not want to repent. They want a man made religion that makes them feel good about themselves. They want total unity of the world, but it’s a world where Christians can never be a part. That is Satan’s plan.
If you are in a church where the pastor speaks of uniting with the RCC or even uniting with Islam — please know that your leadership has fallen away from the Truth of the Word of God. Find a church which is grounded in God’s Word. Ask questions of leadership before you join a church!
Brethren, I am praying that it won’t be long before our Lord Jesus comes for us, but no man knows the time. It would seem that with the world rapidly falling apart, and the many natural disasters happening, that we may be close. I pray it is so.
 Read more: http://www.gotquestions.org/ecumenism-ecumenical.html