TL

”2.Wasn’t primogeniture to do with the first born male in the family, and not really to do with males and females? So would Timothy have really thought of primogeniture relating to Adam and Eve?”

This is true. Also, God did not practice preference of the firstborn.

1. Cain and Able. God preferred Able because of his good heart.
2. I don’t think Abraham was a firstborn
3. Ishmael and Isaac, God choose Isaac before Ishmael was born
4. Esau and Jacob, God choose Jacob in prophecy at his birth
5. Of Jacobs children, Reuben was firstborn, but God choose Joseph and Judah.

And so forth. In God’s economy it’s not about who is born first at all. It’s about who has godly character and is able to formed into the person that God can use.

The only reason that comps get away with promoting that idea is because so many Christians don’t read the Bible.