I'll try to make this simple for you. In the desert, there were certain rules and expectations -- like collecting manna. In Israel, where there was no manna, that practice was not necessary. This doesn't mean that the people in Israel didn't practice biblical Judaism, but that practice of observing the sabbath had to be implemented in a different way. When there was a proper court, there was (rare) capital punishment, but the system had a built in method for when there was no court. No, we have no court, so though we are not doing the behaviors, we are following the same religion. It isn't that complex.