Jehovah's Witnesses do believe in Jesus Christ, but they do not worship him. They believe that Jesus is not the Almighty Father and that only Jehovah is worthy of worship.
Jehovah's Witnesses take Jesus at his word when he said in the Bible "The Father is greater than I am." They do not worship him, since he freely admits that only Jehovah is greater.
While they don't worship him, they do acknowledge his role in the existence of humankind. Jehovah's Witnesses believe the traditional Christian view that Jesus gave his life so that the rest of humanity could live. Jehovah's Witnesses also believe that Jesus' resurrection makes it possible for everyone who believes in him to gain everlasting life.