The Witnesses argue that the Son is inferior in nature to the Father from verses such as these: "The Son cannot do a single thing of his own initiative, but only what he beholds the Father doing" (John 5:19). "I have not come of my own initiative, but he that sent me is real, and you do not know him. I know him because I am a representative from him, and that one sent me forth" (John 7:28-29). "I am going my way to the Father, because the Father is greater than I am" (John 14:28).
What can be said about these verses? First, they may be referring to Christ’s human nature, as distinguished from his divine nature. His human nature, being created, is clearly subordinate to the Father’s divine nature.
Second, they may also refer to Christ’s person insofar as the person of the Son is generated or begotten by the person of the Father. This doesn’t mean he is unequal in his divine nature and therefore not divine. It means there is a certain logical relationship between the two persons of the Father and the Son (who are both equally divine) in which it may be said, rightly, that "the Father is greater than I"—greater in the order of the three divine persons, not greater in the order of nature or being.
Third, they may refer to the Son’s role in the economy of redemption. He came to fulfill the Father’s will in redeeming us and to reveal the Father to us, thus serving the Father. Hence, the Father holds a position in some sense superior to his. Thus the Son might be said to be inferior to the Father in the role he plays, but not in his essential nature.
Are there verses that argue against the Witnesses’ position? Sure. One example is John 5:1-18, where Jesus cures a man on the Sabbath. The Jews became angry because Jesus "worked" on the Sabbath, and in response Jesus said, "‘My Father has kept working until now, and I keep working.’ On this account indeed, the Jews began seeking all the more to kill him, because not only was he breaking the Sabbath but he was also calling God his own Father, making himself equal to God" (verses 17-18). Only God can be equal to himself, and this passage therefore shows that Jesus is God.
The Witnesses also ignore the import of Matthew 28:19: "Go therefore and make disciples of people of all the nations, baptizing them in the name of the Father and of the Son and of the holy spirit." Another translator’s slip here? Note the singular "name." If the Father, Son, and "holy spirit" were three different entities—God, exalted creature, and impersonal force—then they’d have three names, not one name. The fact that the singular is used implies a unity of being.
What is that one name that the Father, the Son, and the Holy Spirit share? If there is a single, revealed name for all three Persons, that name may be Yahweh. There can be no question that God is referred to in the Old Testament as Yahweh (understood by the JWs as "Jehovah"), and this name applies to the Son as well. For example, Jesus speaking in John 8:24 says, "Therefore I said to you, You will die in your sins. For if you do not believe that I am [he], you will die in your sins." Notice that the NWT has added "he" in brackets to obscure the fact that the Greek words here are the words for "I Am." ("He" is not present.) An identical situation occurs at John 8:28.
As any Bible student knows, "I Am" corresponds to Jehovah or Yahweh (cf. Ex. 3:14:"God said to Moses . . . ‘Say to the people of Israel, ‘I Am has sent me to you,’" RSV).