JWs believe that Jesus is a god and not God Almighty.
Jesus is god but not Almighty God?
Jehovah is also called mighty God
Isaiah 10:20-21 But they will support themselves on Jehovah, the Holy One of Israel, with faithfulness. Only a remnant will return, the remnant of Jacob, to the Mighty God.
Jesus was also called “the Almighty”
8 “I am the Alʹpha and the O·meʹga,” says Jehovah God, “the One who is and who was and who is coming, the Almighty.
The “Jehovah” in the above verse refers to Jesus and cannot refer to God the Father because of the following verse. God the Father was never dead and raised to life again. Therefore, Jesus was not only described as Mighty, he was also described as Almighty.