Some Christians I've met appear to think the problem with Judaism is that we're stuck in "Old Testament" times. Some think the problem is that we're not.
To some Christians, Jews are stuck in a world of commandments it's impossible to fulfill, and saddled with blood guilt for Adam and Eve's original sin. To their minds, both original and unoriginal sins put us in a state of impurity that we cannot expiate without the Temple and its animal sacrifices. (They have Jesus' sacrifice to do that for them; we do not.)
To some Christians, Jews have wilfully abandoned the "Mosaic Law" by adding on interpretations and practices we arrived at through rabbinic interpretation. To them, the Talmud and everything after it are illegitimate. They think we should be doing exactly what it says in the Torah, no more, no less.
Both of these perspectives are completely external to the Jewish tradition. Even terminology like "Mosaic Law," "Old Testament," "original sin," and even "sin" (the way they use the word) make no sense to my Jewish mind. But I understand how a Christian, from their own perspective, can hold one or the other of these mistaken and presumptuous views about Jews.
What I don't understand is how they can hold both at the same time! And some Christians do.
