In general, I think the Akeidah was a nisayon to set the stage for later generations R”L who gave up what was dearest to them, including their lives, for Kiddush Hashem. We have had so many kedoshim who refused to convert to other religions and were willing to be slaughtered all through the ages. Hashem wanted to see if Avraham had this mesirus nefesh in him.
Neverthless, we never found any time when a person was asked to kill his own child ever again. And if a person would ever be asked to do so, he would not be permitted, as it is now yehareg v’al yaavor to take the life of any person, including his child.
So while Avraham was asked to withhold his menschlachkeit and humanity at the Akeida, that was a one-time event, and I think that ever since, menschlachkeit is the ikar.
Of course, you may ask me about Mechiyas Amalek and the Milchemes Zayim Amamin. But that is a long and separate discussion, and I am too tired now.