Is Judaism the religion of Jews only?

Yes. Judaism is meant for a single people to serve as a “nation of priests” for the rest of the world, an inspiration and beacon to all. Judaism is not interested in converting non-Jews, since the Torah, the Jewish code of religious law, gives them separate obligations, called the seven laws of Noah. These laws include belief in God, prohibitions on idolatry, theft, murder and the obligation to maintain a proper system of justice.