What is the Origin of the Trinity doctrine and Sunday worship

Below are two quotes where the Catholic Church mock other denominations for following two of their doctrines that they brought into Christendom. Both are pagan, and both originated from sun worship, which was Satan worship from Babylon.

“Most Christians assume that Sunday is the biblically approved day of worship. The Catholic Church protests that it transferred Christian worship from the BIBLICAL SABBATH (SATURDAY) TO SUNDAY, and that to try to argue that the change was made in the Bible is both dishonest and a denial of Catholic authority. If Protestantism wants to base its teachings only on the Bible, it should worship on Saturday.” — (Rome's Challenge, www.immaculateheart.com/maryonline, December 2003)

“Our opponents sometimes claim that no belief should be held dogmatically which is not explicitly stated in scripture ... But the Protestant Churches have themselves accepted such dogmas, AS THE TRINITY, for which there is no such precise authority in the Gospels,” — (Assumption of Mary, Life magazine, October 30, 1950, p. 51)

The question was asked in the Catholic Catechism.

“Q. What is Sunday, or the Lord's Day in general?
 A. It is a day dedicated by the Apostles to the HONOUR OF THE MOST HOLY TRINITY, and in memory that Christ our Lord arose from the dead upon Sunday, sent down the holy Ghost on a Sunday, &c. and therefore is called the Lord's Day. It is also called Sunday from the old Roman denomination of DIES SOLIS, THE DAY OF THE SUN, to which it was sacred.” — (The Douay Catechism of 1649, p. 143)

An interesting statement considering “Sunday worship” and the “Trinity doctrine” both came from sun and Satan worship in Babylon, and they were both brought into Christendom by the Catholic Church whom God calls Babylon!

In 1981, Neal C. Wilson was also GC President and announced that the Church had officially adopted the Trinity doctrine. He wrote, “There is another universal and truly catholic organization, the Seventh-day Adventist Church,” — (Adventist Review, March 5, 1981, p. 3)

What is this doctrine from Babylon doing in the SDA Church?

From https://www.trinitytruth.org