Do Jehovah's Witnesses believe Jesus is God?

No, and it helps to state their view accurately rather than caricature it. Jehovah's Witnesses honor Jesus highly, but they hold that only the Father, whom they call Jehovah, is God in the full sense. On their teaching, the Son is God's first and greatest creation, the one being Jehovah made directly, who then served as the agent through whom everything else was made. Before his earthly life, they teach, he was the archangel Michael. They lean especially on texts like Colossians calling Christ firstborn of creation and John 14:28, the Father is greater than I.

The historic Christian answer is that this is essentially the ancient view of Arius, which the Council of Nicaea weighed and rejected in 325, confessing instead that the Son is of the same nature as the Father, coequal and coeternal. The reply to firstborn is that the Greek word means rank and inheritance, not sequence; Scripture even calls David firstborn though he was Jesse's youngest. And Paul settles it in the very next line: for by him all things were created. A being for whom all things were made stands on the Creator's side, not among the things created.

The question between us, then, is not whether Jesus matters, but something sharp and clear: is Jesus a creature or the Creator? Christians believe John's own words answer it, the Word was God, and that this is the heart of the good news rather than a technicality to argue over coldly.