Are Jehovah's Witnesses "Members of Christendom?"?

There is ONE True Church consisting of all those that truly have been born again and possess ,or should I say are possessed by the Holy Spirit.They uphold all of the teachings of Christ and His apostles.I believe I belong to this Church.If any confessing christian rejects the teaching of the Holy Trinity,rejects Jesus as the Son of God and rejects the Enlightenment of the Holy Spirit that expresses Judgment and a literal Hell that all unbelievers will partake in for all eternity, they are surely Apostate, a wolf in sheep's clothing.