Most people assume that even those who nominally bear the Christian name generally follow Christ's beliefs, teachings and practices. Nothing could be further from the real truth. The New Testament plainly tells us that not everyone who accepts the name of Christ is really a true Christian.
Jesus foretold that many would claim His name but deny Him by their works and actions. He said that such would "call Me 'Lord, Lord,' but not do the things which I say" (Luke 6:46 Luke 6:46And why call you me, Lord, Lord, and do not the things which I say?
American King James Version×; compare Matthew 7:21 Matthew 7:21Not every one that said to me, Lord, Lord, shall enter into the kingdom of heaven; but he that does the will of my Father which is in heaven.
American King James Version×).
Christ and His apostles spoke of false prophets, false apostles and false ministers even during the first century (see 2 Corinthians 11:13-15 2 Corinthians 11:13-15  For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.
 And no marvel; for Satan himself is transformed into an angel of light.
 Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
American King James Version×). They revealed that two opposing, ostensibly Christian religions would emerge.
One would dwarf the other in numbers. But the smaller (the "little flock," Luke 12:32 Luke 12:32Fear not, little flock; for it is your Father's good pleasure to give you the kingdom.
American King James Version×) would be led by God's Holy Spirit and remain faithful to Christ's New Testament teachings. The other would be guided by a satanic spirit of deception, accepting the name of Christ and yet denying His message by twisting His teachings to create a convincing counterfeit that most people would fall for.
The New Testament itself presents a concise historical sketch of the roots of these two manifestations of Christianity—one true and one false. Christ's apostles depicted the origin of each and their fundamental qualities and characteristics.
To know much more, read the free Bible study aid booklet The Church Jesus Built—one of the most important publications we have ever produced.
[ Read the article: A New Pope: Looking Ahead ]