"However the Custody of Infants act was the origin of the tender years doctrine that enshrined in law and made ironclad these gender role notions of women as primary caregivers."
Men's rights to children were not about being the primary carer, it was about being the legal owner! Just as men in days gone by have owned their wives, concubines and slaves.
Who do you think did the bulk of child's care before the Custody of Infants act?
The oppression of women most likely (as far as I can work out) goes back to when we stopped running after 'buffalo' (I believe, all of us) and stopped and settled and stayed in one place.
As far as I am aware before that women, men and children ran after the 'buffalo', killed it, ate it and moved on. Everyone had got to do everything because there was no benefit for the 'little lady' to be at home 50 miles from the 'buffalo' you had just killed. (I am using 'buffalo' in inverted commas because I am not sure exactly what animal was hunted!).
"Perhaps the strongest reinforcement of women's inferior status came with the growth of private property. In many societies, this signaled the end of collective ownership and with it, the matrilineal* clan system. Family, kinship and a host of other social ties were more and more linked to private property."
A HISTORICAL ANALYSIS OF WOMEN’S OPPRESSION
"However you cannot have it both ways" How have women got it both ways?
"... you either have to accept the civilization we enjoy now has been shaped by women and exalt in that fact, or make it all about the men, and render invisible every great woman who has ever lived..."
Ah, I see, in that you've made up some arbitrary rules about how one could view the world. Thanks. But I think most women (and men) would feel that women have had some agency and have done some great things. However, our influence has been limited by the patriarchy. Not sure how you could have missed that one! 
Well done for going to a woman's aid (I mean that most sincerely). And I am very sorry you were stabbed. By a man? By a woman?
"if we men are all collectively responsible for male violence"
I think you are getting a head of yourself here. Patriarchy as a system leads to the inequality. I would not hold you personally responsible for all male violence!
"I suppose it's open season on victim blaming then!" That's a straw man- or woman,
- I've not blamed victims.
"All I can do is what any individual person can do in this world, and try and treat the people I come across as I would like to be treated myself." Ditto
" I genuinely know very little about what I am talking about). In which case go back to hating me, and the world will continue to spin on it's axis as ever it has done."
As said before it is not about hating individuals it is about feeling oppressed by the weight of injustice. I've not suffered at the hands of men, honestly, I have a nice life with a nice husband and I have a daughter and son. But I am aware that the way the world is generally disadvantages women and girls massively. So the hatred' I may feel personally, does not make me act in a hateful way and it is not directed at anyone. It would, for me, perhaps be better translated at massive exasperation."
Good night and thank you for engaging. Despite what some women would have you think feminists are not man haters, despite my feelings of 'hate', I agree with the OP "Please help me to not hate men"!!