yahweh is a god of the blood sacrifice of children

[Ahldagor]

reread it. he trusted in his instructions (of course mom's pov is never mentioned) but he did doubt. the doubt had to be surmounted via the action, hence the binding and knife raising, and as he (still trusting that god wouldn't make him yet trusting that god was right) was about to then the angel called to him a third time (also previously mentioned) to say all was right and dandy.