I would focus on Jesus' promise in Matthew 16:18, which excludes the disappearance of God's church for 1800-1900 years, and the fact is that there is no data to suggest that the theology of the early Christians was even remotely similar to today's JWs By the way, which one is for today's JWs? The current "light"?
In the first place, why did the apostles establish churches, congregations, if true Christianity was destined to disappear in a few decades for almost two thousand years?
Why didn't the apostles write that everyone should wait for 1914, because what we are doing now is irrelevant anyway.
See also Mt 23:2-3, Mt 28:20, Rom 3:3-4, 1 Tim 3:15, 2 Tim 2:13.
However, despite all the problems, the Christian church could not cease for 1800-1900 years, because according to Christ, even the forces of hell cannot take over it (Mt 16:18, Jude 24-25, cf. Eph 5:25-32). So who lied: Jesus or the Watchtower? The New Testament also writes about the need for continuous protection of the faith (Jude 3), not about a complete disintegration after the 1st century. 2Thesss 2:3 does not mean "great apostasy" in JW sense, but defection, revolt, departure (without details), and then the Antichrist also appears, who sits in the temple of God, deifies himself, etc. None of this has happened yet.
Check:
This is a false ecclesiastical ideal, a church without history
With the ahistorical view of the church in the Protestant-background separatist communities it is almost dogmatic. The supporters of this view think of the time before the formation of their own communities as if it were not the history of the universal church, but "only the history of the Catholic Church." They see that in the history of "the Church," between the first great century and their movement born in the 19th century, there is only a long pause. By "church," they exclusively mean their own community, and in the pages of church history, they only want to recognize "true Christianity" in those communities or individuals who meet their doctrinal criteria, so their reference has a precedential value. This is the approach, for example, of the 19th-century American restorationist movement-grown "non-denominational" churches, the adventist and new apostolic churches with the identity of the "church of the end times," and the Mormon religion. Although they all see the essence of restoration differently, they all believe that the "original" Christianity of the first century has risen in them.
First of all, however, Christ claimed that he himself is building his church, and the gates of hell shall not overcome, prevail against it (Mt 16:18). Whoever believes that the true Christian church practically ceased to exist for centuries (meaning that the forces did indeed overcome), with this – intentionally or unintentionally – also claims that Jesus did not keep this promise, but lied. His church was not only wounded and ailing for centuries, but had to be exhumed after many centuries.
The glorious and miserable sides of church history, as well as its exemplary but greatly mistaken figures, are as much the property of Protestants as they are of Catholics and Orthodox – and vice versa. Anyone who has never read from ancient and medieval Christian teachers does not know what they are missing, even if they are a fervent Protestant.
Thirdly, this selective filtering of the past has only served to foster denominational arrogance. If all the sins of the past belong to the Catholics, it is easy to distance ourselves from them and thus feel better and superior – but isn't this the Pharisaic logic (cf. Lk 18:9-14)? The past of the church is not there for us to forget or to pick and choose from what we like to identify with, but to learn from every page – just like from the Old Testament or from the good and bad days of our own spiritual life.
The "apostasia" mentioned in 2 Thessalonians 2:3 will not occur a few decades after the apostles, but according to Lk 18:8, it will only happen immediately before the second coming of Jesus.
THE ALLEGED “APOSTASY” OF CHRISTENDOM
A recent Watchtower magazine expounds the Jehovah’s Witnesses’ view that orthodox Christianity (“Christendom”) underwent a great apostasy after the death of the apostles: “The death of the apostles removed a restraining influence, allowing a widespread apostasy to develop. (2 Thessalonians 2:7, 8) An organization grew up that unworthily professed to be God’s congregation. It falsely claimed to be the holy nation anointed with God’s spirit to rule with Jesus.” (The Watchtower, 15 June 1992, 19.)
The Witnesses believe that the influx of pagan converts brought in doctrines and concepts from Greek philosophy and religion which were then integrated into the Christian faith, resulting in such “false” teachings as the Trinity, the deity of Christ, the immortality of the soul, and eternal punishment in hell. According to the Watchtower Society, Christendom lived in darkness for 18 centuries after this apostasy. Yet they believe there were always individuals who were faithful to divine truth — a truth more fully unveiled when their founder, Charles Russell, began to study the Bible in earnest in the 1870s. To support this view, Watchtower literature regularly cites passages from the church fathers to demonstrate that, even after the apostasy, there were some who believed as Jehovah’s Witnesses do today.
In light of this line of argumentation, it is worthwhile to examine the writings of the early church fathers. If indeed such writings reveal that early Christians believed as Jehovah’s Witnesses do today, then surely a reevaluation of orthodox Christian teachings is needed. If these writings fail to support Watchtower claims, however, then one must conclude that Jehovah’s Witnesses represent a new religious tradition of the late 19th century, with no historical connection to apostolic Christianity.
The body of literature of the postapostolic church is substantial, and a full review would be outside of the scope of a limited survey such as this. The most critical period is that prior to the Council of Nicea in A.D. 325, because it is historically closest to the apostles.
Did a Great Apostasy Occur?
Was the true faith taught by the apostles lost or corrupted within the first generation after the apostles? If so, then the true faith was not successfully transmitted anywhere in the evangelized world of the first and second centuries — including churches established by the apostles, with leadership appointed personally by them. A “great apostasy” would require an extraordinary event: the simultaneous loss of faith by an entire generation of Christians throughout the civilized world. Included in this apostasy would be disciples of the apostles themselves, as well as those who witnessed the thousands of martyrs who, just a short time previously, refused to deny Christ, either explicitly or by worshiping pagan gods.
A great apostasy, wherein the doctrines of Greek pagan philosophy replaced apostolic teaching, would most likely have begun in areas where the church was accepting a large number of converts with backgrounds in Greek religion and philosophy, such as Alexandria, Egypt. The prominent western churches established directly by the apostles, such as those in Rome and Antioch, would likely have fallen into heresy more slowly. But the historical facts do not support this (or any other) scenario of a “great apostasy.” Had a great apostasy begun immediately after the death of the apostles, as the Watchtower claims, a mixture of “true Christianity” (i.e., Watchtower–type teachings) and “pagan heresy” (i.e., orthodox Christian teachings) would be discernible in the literature of the early church, which was widespread in its geographical points of origin.
Is it possible that all the writings of the followers of the “true faith” were completely destroyed by the paganized church? Such a view is highly improbable. Many manuscripts have survived from Gnosticism (a widespread religious movement of this period which combined elements of Greek paganism and eastern mystery religions), despite several centuries of concerted attack and condemnation by the church. Yet not a single document exists pointing to a group who believed as the Jehovah’s Witnesses do today.
The absence of such early “Watchtower” literature causes one to doubt the existence of the so-called “faithful and discrete servant class.” After all, the stated purpose of these 144,000 anointed servants in Jehovah’s plan is to provide “meat in due season” — that is, literature that imparts “accurate knowledge” about the Bible. If these early Jehovah’s Witnesses were true to the kingdom gospel, handed down to them by the apostles, they would have written sufficiently to provide the faithful with an understanding of the Scriptures. Keep in mind that the Watchtower Society teaches that the Scriptures cannot be properly understood without such aids. The Watchtower Society, while claiming to use the Bible alone, actually teaches that the Bible cannot be understood without the aid of the “meat in due season,” the literature provided by the Society — its interpretation of Scripture being the only valid one. Yet where is the Watchtower literature of the first and second centuries — or for that matter, of any century prior to the 1870s? Its absence is most telling, and highly damaging to the claim of a general apostasy with just a few of the dedicated faithful surviving.
Perhaps the most compelling argument against a universal early apostasy may be found in the commissioning and empowering of the apostles themselves. If a universal apostasy occurred immediately after the death of the apostles, we would have to judge the apostles as incompetent or negligent evangelists who utterly failed to accomplish Jesus’ commission to make disciples. Such an apostasy would reflect poorly on Jehovah God as well, whose “holy spirit” was unable to preserve His followers for even a single generation.
There is, therefore, no reason to believe that a great apostasy occurred following the death of the apostles, with the resulting loss of the “true” Christian faith for over 1800 years. This conclusion seems undeniable in view of the Great Commission, the power of the Holy Spirit, the absence of literary evidence for an alternative group of believers with a gospel similar to that preached by Jehovah’s Witnesses, and the implausibility of the required simultaneous loss of faith by an entire generation of geographically dispersed Christians.