Basically everywhere you look, you will only find resources on how men and women are or should be equal, etc.
Obviously this is NOT the case, from a biological perspective we are a sexually dimorphic species and males are larger. Also, watching animals, most of situations show males leading (with very few exceptions and sure enough in those exceptions women ARE larger).
Can you point me to other texts where it was also argued that women are NOT equal to men?
All people should be treated equally and have equal opportunity regardless of any classifications they might fall under.
However, people are not exactly equivalent to one another. Different people have different strengths.
One of the main arguments for men and women being different is the fact that nearly all sports have one category for men and another for women. Why is that?
If you want measurable differences find what a country's average height is for men and women or see what the average age of death is. Are they statistically equal or not?