While on earth Jesus taught about Himself, His impending death on a cross, and His plan of salvation.  Jesus claimed to be God. And we have “three witnesses: the voice of the Holy Spirit in our hearts, the voice from heaven at Christ’s baptism, and the voice before he died.  And they all say the same thing: Jesus Christ is the Son of God.” (1 John 5: verse 8) God is saying all of this to each of us, so clearly.  If we do not believe this, we are effectively calling God a liar.