Yes, he was an ignorant automaton, a lemming. I know.Indeed thought of sinning can lead to sin. However Abraham didn't think of killing his son and as a result went about it. He was following direction without thought of his own, just as he did when God told him to leave his land. He didn't contemplate where he would go or how he would get there or how he would sustain his existence. He simply had Faith in the direction and will of God.
Why anyone would expend faith on a psychopathic sadist is beyond me.