There are more people then only the Jehovah Witnesses who believe in only One God. Bible Students, Bible Researchers, Church of God, Christadelphians or Brethren in Christ, Nazarene Friends, Nazarene Fellowship, Unitarian Christians are just a few.
Jesus / Yeshua / Yashua is the Son of God, who really died for our sins, and is the promised Messiah who shall judge at the end times.
It is important that people should find their Saviour and the Father of the Nazarene Jewish man and his God, the Elohim, Jehovah/Yahweh the Only One God of gods. This Creator has given His Word, which is the Bible to educate us all. The Holy Scriptures: Old and New Testament are a must read and explain everything we should know.