Really? I hadn't noticed! Shucks...I must be one of those poor naive religious folks.
You seem to be adopting the idea--and correct me if I'm wrong--that "normal" is defined by what actually occurs in human populations. So if people do it...then it must be normal.
But is that really accurate? So if, say, a culture evolves that promotes statutory rape...then that behavior is normal?
There isn't a society alive that works that way though...every society has a system of "ought". Though of course there are people that go against that system, the system doesn't go away because of those who buck it. And I've never heard of any culture, frankly, that basis said system on what it views in the animal kingdom.
Uh, well, yeah. But, of course, the collective force of the society and culture within any given human culture shapes the definition of normal as well as individual behavior. (See my posts:33,37,39,40)
And there is this long-standing "notion of perfectibility" which has been introduced by Judeao-Christian religions which has systematized certain ideals to which humankind strives. And, finally, there's the notion of a duality: Animal-Man, or Beast-Noble, or Mind-Body (whatever you call it) that has also characterized mankind since...well, forever.
Is there an ultimate definition of "normalcy" and, if so, what is it?
Some people presume there is, others disagree...and on it goes.