[Lukongsimi]

For thousands of years, not a single prophet of God ever said God is a Trinity, not even Jesus.

You are ignoramus 

• Isaiah 9:6:
  This verse speaks of a child who will be born, described as "Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace." Christians interpret this as a prophecy of Jesus, who is seen as God the Son, and the titles also relate to the Holy Spirit (Counselor) and God the Father (Everlasting Father). 
  
  
• Isaiah 48:12-16:
  This passage describes God speaking of himself as the First and the Last, and then saying, "And now the Lord God and His Spirit have sent Me." Christians interpret this as the Father, the Spirit, and the Son (Jesus) working together, indicating a plurality within the Godhead. 
  
  
• Other passages:
  Other Old Testament passages that Christians use to support the concept of the Trinity include Isaiah 63:7-10, and various passages that refer to God as Elohim (a plural noun).