Why did jesus spend time in a temple learning a book he supposedly wrote, since he and god are the same entity?

He had a crush on the mousy librarian there.

There is no record that Jesus spent time in the Temple learning the law. When he came of age he spent time discussing the law with those who taught there. But he never was a student there, very likely because his birthright was in question.

All evidence points to the fact that Jesus, if he existed, was illiterate and must have learned the Hebrew laws and myths orally.

"Christ the son of Mary was no more than a messenger; many were the messengers that passed away before him. His mother was a woman of truth. They had both to eat their (daily) food. See how Allah doth make His signs clear to them; yet see in what ways they are deluded away from the truth!" (Koran)

God the Father and God the Son are as one because the Father is in the Son and the Son is in the Father, they see eye to eye on all things, they are always in total agreement. But it is God the Father which inspired the writings of His holy book...

citation requested