What do you see below the surface of Christianity, if that is your point?
I think there's a lot more to the tradition than most people think. For example, I don't think Pauline Christianity runs on the kind of ethical system that most modern Christians take for granted. When Paul says, "All things are permitted, but not everything is useful," and when he goes on about how the Law has been shattered, I don't think he's just blowing hot air. He's actually arguing for a radically different ethical system than people normally associate with Christianity today. It's not based on obedience to a master, but rather on actualizing people's true nature as perfected beings in Christ, for whom for whom the old superficial divisions are fundamentally unreal. It's the diametric opposite of legalism.
Buddhist ethics is impossible to explain comprehensively in a nutshell, but the basic starting premises are (1) that everything occurs because of certain causes and conditions in a regular and more or less predictable way, (2) people's actions--including mental actions--have consequences that ripple outward but also end up reinforcing habitual thoughts and behaviors, and (3) there are certain patterns of behavior that can predictably result in favorable or unfavorable outcomes (including the formation of habits that in turn are more likely to lead to favorable or unfavorable outcomes).
What is favorable or unfavorable? On a very basic level it's obvious: for example, pain and suffering are unfavorable, whereas satisfaction and tranquility are favorable. Beyond that it gets complex, such as how we know that it's often worth momentary discomfort to get something better down the road, and how it's not good to indulge in momentary pleasure that will have dire consequences down the road. Even more complex is the question of interpersonal relations and responsibilities.
Buddhist ethics is predicated on the tradition's deconstruction of the self to the degree that self-referentiality is seen as a poor rubric for ethical behavior. The reasons for this are given, but I don't have time to get into them now. Basically, you want others to be happy and to avoid pain not because it's good for you personally, but because you want to be happy and avoid pain and you recognize that there's no fundamental difference between you and someone else. At heart, there's the idea that compassion and wisdom are the same thing: deep understanding of the nature of things will show you that others' pain is your pain and their happiness your happiness. You should treat others with the same regard that you treat the person who will go by your name in the future, who will be different from you in many ways, yet you still reflexively care about that person's wellbeing. The key is to generalize that care beyond the restrictive sense of self.
And when you have that attitude and behave in that way, you really do become happier and more well-adjusted than a person whose entire outlook is "me-based." You draw people in by telling them that this way of approaching the world will make them happier and make them suffer less, and then once they try it they find that it's true and will develop faith in the process. There are still difficulties that people will face, such as tragic events and emotional catastrophes. Buddhist tradition prescribes certain types of meditation practice to go with the ethical system and help people to train their minds to have proper perspective and break out of habitual emotional reactions and unconscious prejudices. If you practice hard enough, you can learn to love even people you used to think of as enemies (there's a specific technique for that) and to maintain composure even when something terrible happens.
You'll note that there's no attempt to create a comprehensive list of
dos and
don'ts. There are plenty of maxims and precepts to be found (the
Dharmapada is nothing but a list of moral suggestions, and all lay Buddhists take a set of 5 precepts that cover the stuff deemed most likely to cause people problems), but the Buddhist tradition mostly prefers to focus on core principles and trust that people can apply those as needed to their particular circumstances, with the understanding that all circumstances are unique and that moral sophistication entails being able to make complex decisions through honest awareness of those circumstances.