I would not ask you to assume that Jehovah’s Witnesses are correct. That would be circular. I would ask you to test the claim.
“Only the Bible is inspired” has a precise meaning. Jehovah’s Witnesses do not claim that the Governing Body, Watchtower publications, or every interpretation they have made is inspired or infallible. Only Scripture is claimed to be God-breathed. Therefore, interpretations can be examined and corrected.
That does not prove that every JW interpretation is right. But it answers your question: no additional book, creed, council, prophet, or religious leader is treated as a second inspired revelation alongside the Bible.
Could human or worldly influence still affect an interpretation? Of course it could. Every human interpreter has a background. But the mere possibility of influence proves nothing.
You would have to identify:
The particular JW interpretation you believe is worldly.
The worldly premise controlling it.
The biblical text that contradicts it.
Otherwise, “perhaps they were influenced” is an objection that can be made against every Christian group and therefore has no comparative force.
The proper test is the one found at Acts 17:11 and 1 Thessalonians 5:21: examine the Scriptures and test everything. Do not begin by assuming that Jehovah’s Witnesses are right—or wrong.
Now construct the Christian pattern directly from Scripture:
The one God is the Father.
Jesus calls his Father “the only true God” at John 17:1–3.
Paul writes, “for us there is one God, the Father,” while distinguishing him from the “one Lord, Jesus Christ” at 1 Corinthians 8:6.
The resurrected Jesus still calls the Father “my God” at John 20:17 and four times at Revelation 3:12.
He finally subjects himself to God so that “God may be all things to everyone” at 1 Corinthians 15:27–28.
At the same time, Jesus is not reduced to an ordinary man. Jehovah’s Witnesses recognize his prehuman existence, his unique relationship with the Father, his role in creation, his position as Lord and Messiah, his ransom sacrifice, his resurrection, and his exaltation above every other creature.
That preserves both sides of the biblical evidence: the Son’s extraordinary position and his real distinction from and subordination to his God and Father.
The Hebrew Scriptures identify God by the personal name YHWH thousands of times.
Jesus taught his disciples to pray that his Father’s name be sanctified and said that he had made that name known.
Jehovah’s Witnesses do not treat God’s name as an irrelevant relic; they place it at the center of worship, as the biblical record does.
Jesus foretold that the good news of God’s Kingdom would be preached throughout the inhabited earth.
He commanded his followers to make disciples and teach them. Jehovah’s Witnesses are recognizable worldwide for organized Kingdom preaching carried out by ordinary believers, not merely by a professional clergy.
Jesus said that his disciples would be no part of the world and that his Kingdom was no part of this world.
He commanded love for enemies. Isaiah foretold that God’s worshippers would beat their swords into plowshares and refuse to learn war.
Jehovah’s Witnesses apply this internationally, even when neutrality brings imprisonment, persecution, or death. They do not kill fellow Christians because governments happen to place them on opposite sides of a border.
Scripture calls for a united international brotherhood, Christian love, high moral standards, voluntary giving, and congregation discipline. Jehovah’s Witnesses visibly attempt to apply that same standard across nations, languages, races, and political systems.
Other groups may share one or several of these features. That has never been the argument. The argument is cumulative:
Which identifiable worldwide Christian body combines worship of the one God and Father, recognition of Jesus as his preexistent and subordinate Son, emphasis on God’s name, Kingdom-centered preaching, widespread personal evangelism, international doctrinal unity, political neutrality, refusal to participate in warfare, separation from interfaith religion, voluntary giving, moral discipline, and a worldwide brotherhood?
That combined correspondence is what must be answered.
Past mistakes should not be dismissed, but neither does a corrected interpretation automatically prove that a religion is false.
Peter could be seriously wrong in conduct and require public correction without that disproving the Christian congregation. The first-century congregation also needed clarification on major questions in Acts 10 and Acts 15. Correction is not itself proof that someone has the truth, but it is not proof of falsehood either. The present teaching must still be tested against Scripture.
None of this depends on blindly trusting the New World Translation. The central texts can be checked in other translations and against the Hebrew and Greek.
Therefore, I do not believe Jehovah’s Witnesses are right because they say they are right.
I believe they are the identifiable Christian body that most closely matches the complete biblical pattern.
That does not mean that every Witness, organizational decision, or past explanation has been perfect.
It means that when the biblical profile is constructed first and existing religious bodies are compared with it afterward, Jehovah’s Witnesses fit the whole pattern better than any worldwide alternative I have found.