One thread recently stated, the religious organization of Jehovah's Witnesses started as a protestant or pentecostal as it were then ended up being Roman Catholic in their mode of operations. The evidence of their being exclusive is found in their own publications....
Obviously, a basis for approved fellowship with Jehovah’s Witnesses cannot rest merely on a belief in God, in the Bible, in Jesus Christ, and so forth. The Roman Catholic pope, as well as the Anglican Archbishop of Canterbury, professes such beliefs, yet their church memberships are exclusive of each other. Likewise, simply professing to have such beliefs would not authorize one to be known as one of Jehovah’s Witnesses..... Watchtower April 1986
What can be drawn from the above as it applies to the religion of Jehovah's Witnesses and other Christian denominations
1. Approved fellowship with Jehovah’s Witnesses and other Christian denominations cannot rest merely on a belief in God, in the Bible, in Jesus Christ.
2. That The Roman Catholic pope, as well as the Anglican Archbishop of Canterbury, professes such beliefs, yet their church memberships are exclusive of each other is enough standing for Jehovah’s witnesses to be exclusive from other Christian denominations.
3. Jehovah's Witnesses agree to the fact that their are some beliefs unique to other Christian denominations which Jehovah’s witnesses often classify as false teachings and they used in labeling them false Christians but will not readily accept their own unique beliefs used to assert exclusivity are equally stated to be false.
4. Jehovah's Witnesses uses the template of Christendom aka Babylon the great in their mode of operation and therefore not different from those they love to condemn.