What was the purpose of the original question? It does not seem to have been addressed in any of the comments to any significant degree. If the question is meant to prompt thoughts about the validity of 'Christianity' vs. Jehovah's Witness' I think it can be summed up pretty easily:
Christianity stands alone, it is solely an individual thing, one person knowing Jesus as the Christ and all that encompasses... there is NOTHING beyond that, not denominations or doctrines created by man's thoughts on 'things of God'. Jesus did not hand out franchises or appoint ANY individual to stand in his stead. The scripture most accurately accounting the best known 'original' writings is without doubt the KJV version of the Bible. The translators, editors, and scribes and the details of their effort are all known and there is no secret as to how they derived the finished work.
Jehovah's Witness is based on totally different beliefs. The deity of Jesus is explicitly denied. Their scripture is claimed to be 'a Modern Translation' of the Bible, bunk! It is rife with specific changes made to support the claims of the cult. The origins of this debacle are mysteriously not disclosed. The most significant doctrines are no where mentioned in the REAL Bible, which somehow the cult claims to base its 'new and improved' version of things. The infamous 144,000 'saved' is truly ridiculous and is derived on some really convoluted reasoning on specific scripture to again support the claims of the cult. The Watchtower is the center of JH, not the teachings of God or a personal relationship with Him.