So, if Christianity is based on beliefs, not heritage, then we must be very careful what those beliefs are. What do you have to believe to be a Christian? To answer this question, the Christians through history have offered extensive "creeds," statements of specific beliefs that express orthodoxy, or right belief.
Jews, on the other hand, freely argue their opinions about their scriptures. They don't worry about being labeled heretics. For them, Judaism is like family. It's permanent. You can't be kicked out, no matter what you believe. "Two Jews, three opinions," as the saying goes. One can speak of an atheist Jew, but there's no such thing as an atheist Christian.
Jews and Christians both argue within their traditions, but Christians are more interested in deciding who is "in" and who is "out." We must determine who is right and who is wrong. Jews are stuck accepting each other, even those with strange views of God.
Seems like we can learn something about accepting each other.