Christendom's Trinity: Where Did It Come From?

[amazing grace]

They are one in the nature of being God amazing grace.
The word "God" is not the personal name of the Father, it is His divine nature. (Rom 1:20, Acts 17:29)

The testimony of TWO people is true . . . Jesus is one who bears witness about himself and the Father who sent him bears witness about him . . . If Jesus is God and the Father is God and here they are referenced as two separate and distinct individuals does that equal two gods? If not, why not?

So, we are to understand John 8:16-18 as reading/meaning "the testimony of TWO 'in nature of being God' is true . . . . I, Jesus, bear witness about myself ----- my nature and the nature of my Father bears witness about me."

What about the law from the OT which Jesus is referencing? A single witness shall not suffice against a person for any crime or for any wrong in connection with any offense that he has committed. Only on the evidence of two witnesses or of three witnesses shall a charge be established. Is it meant in the same manner, i.e. in reference of 'divine nature'? Is that how the Jews would have understood this law? Did Paul also have this same understanding when he referenced this in 2 Cor. 13:1 - I don't believe so.