Jesus is God’s special revelation. How do we know it's really Jesus? It's mentioned at least twice in the Bible:

No one has ever seen God, but the one and only Son, who is himself God and[a] is in closest relationship with the Father, has made him known. (John 1:18)

Salvation is found in no one else, for there is no other name under heaven given to mankind by which we must be saved.” (Acts 4:12)