I have discovered in the Book of Jubilees that my theory about Abraham never being an idol worshiper is correct. In chapter 11, about Abram, it says,

And in the seventh year of this week (1876 A.M.) she bare him a son, and he called his name Abram, 15. . . 16 And the child began to understand the errors of the earth that all went astray after graven images and after uncleanness, and his father taught him writing, and he was two weeks of years old, (1890 A.M.) and he 17 separated himself from his father, that he might not worship idols with him. And he began to pray to the Creator of all things that He might save him from the errors of the children of men, . . .

Chapter 12

[Abraham tells his father that idol worship is false and we should only worship the true God.]

6 And his father said unto him, I also know it, my son, but what shall I do with a people who have 7 made me to serve before them? And if I tell them the truth, they will slay me; for their soul cleaves to them to worship them and honour them. Keep silent, my son, lest they slay thee.’. . .

And in the sixtieth year of the life of Abram, that is, in the fourth week, in the fourth year thereof, [1936 A.M.] Abram arose by night, and burned the house of the idols, and he burned all that was in the 13 house and no man knew it. And they arose in the night and sought to save their gods from the 14 midst of the fire. And Haran hasted to save them, but the fire flamed over him, and he was burnt in the fire, and he died in Ur of the Chaldees before Terah his father, and they buried him in Ur of 15 the Chaldees. And Terah went forth from Ur of the Chaldees, he and his sons, to go into the land of Lebanon and into the land of Canaan, . . .

How did Abram come to know that idol worship was wrong? Probably from Noah, (as I stated in an article about Genesis, which may not currently be on the website).