A man and his injured wife are walking down an alley when confronted by a group of armed guys. They demand he give her over, and say he can go if he does. Knowing she will die, his response is;
"Ok.", and he pushes her forward. Without even a "Sorry honey, but I have to save the world, you know how it is." No attempt at bargaining, intimidation, persuasion, appeal to a higher power, stalling until help arrives. Even for an average Joe this seems... . An average Joe wouldn't be expected to say "Take me instead" for instance, but to not try anything would be a tough one to explain to friends and family unless he claimed to be overwhelmed by fear.
Now, for someone who has sworn an oath that deals with courage, protection, standing up to evil, etc. in a world where gods exist, and that oath has literally granted them tangible magical abilities damn... that's hard to justify.
god: "Woah, you had to give her over to be killed and eaten? The monsters wouldn't even talk about it? That's rough but I'm sure you had absolutely no choice."
PC: "Well, no they did talk. They offered me a deal. I took it."
god: "Wait, what?"
First, it was not a deal it was a coercive demand. "Do this" is not a deal even if you accede, when it accompanied by explicit or implicit "or else".
Second, we only have a single side of the story and it is light on detail.
I don't think there is any argument that the player demonstrated, at best, unskilled play. Attempting at a minimum to negotiate or investigate would have been better play. Players exhibit a wide range of skill. Even a skilled player demonstrates a wide range of adroitness during play. Players are also often 'trained' to respond in certain ways based on the DMs they've had in the past and by previous behaviour of the current one.
Frankly, I would say the same about the DM's play in this instance as well despite it being the DM's side of the story.