Idomeneo: The Story of Abraham With a Twist?

Attending Mozart's "Idomeneo" at the Met the other night got me thinking -- and I'm certainly not the first to have made this connection -- of the Biblical story of Abraham.

In both cases, a god requires a mortal to kill his first-born or at least most important son. That's perhaps the most difficult order a father could receive, in a patriarchal society at any rate.