Abraham

Sol wanted to know how any ethical system—much less a religion so indomitable that it had survived every evil mankind could throw at it—could flow from a command from God for a man to slaughter his son. It did not matter to Sol that the command had been rescinded at the last moment. It did not matter that the command was a test of obedience. In fact, the idea that it was the obedience of Abraham which allowed him to become the father of all the tribes of Israel was precisely what drove Sol into fits of fury. After fifty-five years of dedicating his life and work to the story of ethical systems, Sol Weintraub had come to a single, unshakable conclusion: any allegiance to a deity or concept or universal principal which put obedience above decent behavior toward an innocent human being was evil

Hyperion Cantos, Chapter 4 - Dan Simmons