I disagree. It is impossible for anyone to make an informed choice without a knowledge of good and evil.
Yes, and welcome to the human condition. All we can do is make our best guess, follow through, and hope/trust that it's enough. This has always been a fundamental truth of Judaism, and especially of Christianity, in which we are promised that it will be enough.
But this is a lesson that few religionists, and particularly Christian religionists understand. As they have been taught, and so believe, that it's all about "obedience". That their big (original) sin is disobedience: disobeying God's laws (really the church's laws) regarding good and evil. When in fact, according to the story, our original sin was hubris. It was mankind presuming unto himself a knowledge that he was never given, and does not actually possess. A knowledge that only God could possess. That is the knowledge of good and evil. And since we do not possess this knowledge, we presumed that whatever is good for us, is "good", and whatever is not good for us is "evil". We allowed our own self-centeredness to become our false 'divine wisdom'. And then we began to judge and condemn all the world, ourselves, and each other, accordingly. And we set out to "correct" all God's creation according to OUR presumptions of righteousness. And thus we have been enslaved to this task, and at enmity with the world around us, ever since.
God doesn't want us to go through life clueless.
That's exactly what God intended, originally, and that's exactly what we were. Clueless. At least that is what we were until Christ appears. And then through Christ, we received the awareness of God's spirit within us, to heal us, and guide us, and save us from ourselves. And to restore our proper relationship to Creation (Eden).
But so far we are still wallowing in the hubris of our original sin. The sin of presuming ourselves to be God's equals, and of possessing the knowledge of good and evil from which we then judge and condemn ourselves, each other, and all Creation.
How can a person actually choose to do good if there is no alternative?
He has to trust in the spirit of God's love, forgiveness, kindness and generosity within himself, to guide him. And trust that it will do so, and that it will be enough. This was Jesus' message and promise to us; that the spirit is there, and that it will be enough.
And if a person is doing good when there is no other option, what does that really say about the person and his desire to please God.
"Pleasing God" has nothing to do with it. Being what we were created to be, or denying what we were created to be, is our choice. And will be either our salvation or our destruction.
Jesus told His disciples to "be... perfect, even as your Father in Heaven is perfect." How can we ever hope to become better human beings over time if we didn't have to choose our actions, having a knowledge of the difference between good and evil?
We can never be "perfect" by our own intent. We don't even know what that is. We can only be "perfected" through our faith in the spirit of God, within us.