Jews are chosen to keep G-d's commandments. Not just the Big Ten but all 613 commandments given in the Torah. We were chosen because we said at Mt. Sinai "We will do and we will listen." (Or something like that; sorry, I am no Bible scholar) We agreed to follow G-d first and then to hear what the rules would be. We are supposed to be a light unto the G-dless nations. This does not include Christians who are also following the same, One and Only Creator. We are not chosen because we are in any way better, only that we agreed to take on the yoke of serving G-d. This is how I understand it and how I raise my Jewish sons.