God... Truth or fiction?

So, Jews who don't recognize the Trinity wrote their own Old Testament? How clever of them, they were thinking politically, so they wouldn't have to worry about it later at the Ecumenical Council.
And regarding the idea that God has always existed – that's also debatable. Everything that has an end must also have a beginning, and before the beginning, there must have been something else. Therefore, before God, there must have been other gods and demiurges, something else that we don't understand.