Both are theistic, but neither have Christ as a central tenant in their theologies.

With all due respect, please check your sources:

What do Jehovah's Witnesses believe? (http://www.watchtower.org/e/jt/article_03.htm)

• Christ is God's Son and is inferior to Him Matt. 3:17; John 8:42; 14:28; 20:17; 1 Cor. 11:3; 15:28
  
• Christ was first of God's creations Col. 1:15; Rev. 3:14
  
• Christ died on a stake, not a cross Gal. 3:13; Acts 5:30
  
• Christ's human life was paid as a ransom for obedient humans Matt. 20:28; 1 Tim. 2:5, 6; 1 Pet. 2:24
  
• Christ's one sacrifice was sufficient Rom. 6:10; Heb. 9:25-28
  
• Christ was raised from the dead as an immortal spirit person 1 Pet. 3:18; Rom. 6:9; Rev. 1:17, 18
  
• Christ's presence is in spirit John 14:19; Matt. 24:3; 2 Cor. 5:16
  

And for the Mormons:

Jesus Christ established His church (http://www.mormon.org/mormonorg/eng/basic-beliefs/the-restoration-of-truth/jesus-christ-established-his-church)

A few hundred years before the birth of Jesus Christ, people had fallen into apostasy. When the Savior began His mortal ministry, He restored His gospel and established His Church again on the earth. He built His Church upon the foundation of the apostles and prophets, He himself being the chief cornerstone (Ephesians 2:20).

Jesus Christ called twelve men to be His Apostles—including Peter, James, and John—and laid His hands on their heads to give them priesthood authority ( Matthew 10:1; John 15:16; Matthew 28:19-20). Before the Savior’s death and Resurrection, He gave His Apostles priesthood authority to teach His gospel, perform the ordinances of salvation, and continue to establish His Church in the world.

The Savior's coming fulfilled prophecy. He set a godly example and showed men what Heavenly Father was like. Yet He was rejected of men and crucified. He made the Atonement by suffering for the sins of all men. After His Resurrection, Jesus Christ guided His Apostles through revelation, making the Church of Jesus Christ a church led by God and not by men ( Acts 10; Revelation 1:1).

...

Jesus is central to both religions. They do not see Christ in the same way that mainstream Christian churches do, but the same can be said about Orthodox churches, the Coptic church, and others.