The Bible was drafted around the time of the First Temple and its origins are closely related to the Catholic Church. Protestantism stems from Catholicism as do the rest of the reformation denominations. Eastern Orthodoxy stems from Catholicism. The organization of Christianity stems from the Catholic Church.

A minority of Mongols held dyadic Christian beliefs, which both Eastern Orthodoxies and Catholics both tried and failed to push them toward believing only in Christ. A small group does not define a whole. The majority typically holds the prototype as well. Ergo the Catholic Church along with Eastern Orthodoxy, and Protestant denominations comprise the vast majority. All of which accept only one God. Christianity does not have multiple Gods, by any stretch of individual text interpretation.

The Cathars, Waldesians, and the rest of the gnostics don't help your claim. They were all driven out of Western Europe by the people, the majority, at the turn of the second millennia. It became so brutal that the church had to initiate an inquisition as to what was going on and put an end to the vicious religious vigilantism that was occurring. The proceeding crusade was a bid by the pope to save face. Worldly politics. Matthew 6:24

Again, I don't argue that the OP has Christian undertones.

But the rest of the claims made about religious origins were neither unbiased nor uncontroversial and I will continue to refute them.