Father, (some use Mother), Son are terms used by Israelites simply to indicate their beloved relationship to God. The Jews believed in One God, however there are some depending on which era,, that have disbeleived and took Ezra as Son of God. And Paul a Jew repeating the same disbelieve and took Jesus as Son of God.
Obviously the two Son of God figures must have done miracles comparable to God. So it was easy for the disgraced one to convince them to disbelieve.
The same happened to early generations of Adam (a.s) descendants, they end up from believing to disbelieving One God. Either they forgot or they no longer fear God for God do not grant what they wish, thus they seek thru other means (idols) for miracles. Again the disgraced one must have answered their needs thus convincing them to disbelieve.
Why did God agree to the term requested by fallen disgraced one in the past. Certainly, it can only be one reason which is to be a test for mankind.