As I understand your argument you think that if it were not for religion then humans would act like animals.
Whereas I maintain that any intelligent (imaginative) animal would invent religion as a society which could then impart some real (and imagined) benefits to its members. This would normally be to the detriment of those who are not members of the society. (only Christians go to heaven) (or Muslims)
Male dominance is one benefit (?) that is aided and abetted by religion. However deer have the same behavior albeit with different equipment. Nobody has accused deer of excessive religiosity or intelligence. And apparently inbreeding isn't much of a problem in open deer society
Prince Charles is a product of comparatively closely held bloodlines. Definitely incestuous in China anyhow. (closer than fifth cousins is taboo) However he was out crossed with Diana. This seems to have resulted in some fairly normal specimens of humans. This is probably the human equivlent of the three breed cross favored by beef farmers. :wink:.
My point being that when we form societies they take on an existence of thier own in which the interests of humanity is subordinated to the interests of those who think that they are controlling the society. They are wrong
The society which they formed now has it's own interests
They are dictated by evolutionary pressures just as much as an amoeba.
You don't need examples, regrettably
We could do better but we don't