Anything that opposes the Gospel and justification by faith apart from the works of the law is anti-Christ.
You cannot say that Jesus Christ only made a limited atonement and be a Christian. The statement is anti-Christ, simply because it is in opposition to the Gospel. The Bible makes it clear that Jesus has victoriously defeated sin, death and the devil and in doing so has reconciled us and the world unto God, 2 Corinthians 5:18, 19.
You cannot say that Jesus did not atone for all of the sins of the world and be a Christian, especially when there are numerous scriptures that say he did, such as 1 John 2:2. To say that Jesus did not atone for all of the sins of the world is anti-Christ because it is in opposition to the Gospel.
The Gospel is the "Good News" that Jesus Christ in our name and on our behalf, has fulfilled all of the righteous demands of God's Holy Law and in doing so has justified us, Romans 3:26.
The Gospel is the "Good News" that while we were yet sinners Christ died for us. "For he has made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him" 2 Corinthians 5:21.
It was the work of Christ that saves us and justifies us. To oppose that, or to say that the work of Christ was not sufficient to save to the uttermost, Hebrews 7:25, is anti-Christ. Organized religion and the Gospel of Jesus Christ are not compatible, never have been and never will be.
Organized religion is based upon law and works. Read the by laws of any organized church and you will see that the whole function of the church is law based. There are no laws for the Christian. Christians are called to live by faith and not by laws or rules, "The Just Shall Live By Faith". Organized religion keeps it members under the law so that it can keep a hold on their bank account.