It's not about living a "moral" life because a moral life is the baseline for everyone--it's the average. Jesus teachings takes us beyond a that ho-hum moral life that most go along with into something greater. Now, if a moral life is all someone wants, that's fine, just as that passing 'C' grade in school is fine. Go with it. But to wave aside something greater than just moral living based on no physical proof of miracles is not good reasoning. Let's go back to the C-student reasoning: It's not worth the extra effort to earn an A or even a B. That is sound reasoning. So simply say, "It is not worth the extra effort it takes to live something greater than a simple moral life."