To clear up some confusion of what is pagan and what is Divine.
A Pagan Sacrifice would be human or beast etc.
Where as a Divine Sacrifice was to be be a great and last sacrifice also it must be an infinite and eternal sacrifice.
So the Father, Son and Holy Ghost are Divine being of the Godhead. So trinity would not qualitfy to be Pagan.
Be sides the Godhead is not human.
Jesus was of both the son of man and the Son of God.
No human has that parentage!
You have cleared up nothing....and I don't think we are talkin' sacrifice here!
All Pagan religions from the time of Babylon, have adopted in one form or another a trinity doctrine or a triad or trinity of gods. In Babylon it was Nimrod, Semiramas, and Tammuz; In Egypt it was Osiris, Isis, and Horus; within Israel pagan gnosticism it was Kether, Hokhmah, and Binah; In Plato's philosophy it was the Unknown Father, Nous/Logos, and the world soul. But in Old Testament Judaism there was only One God, a numerical ONE.
If you cannot see that the Nicean council adopted this heresy as a convenience and established an un Biblical creed to support it.....well....what can I say? You are simply following pagan doctrine established by the Roman church. So be it.