I was recently asked by someone I very much respect to address "the" question. So I started to write the answer in a post... about five times without any luck. The "Why does a 20-something join a Reform Congregation" question.
When we love something, we want to share it – so why not be inspired to bring our Jewish friends into the kehilla kedosha (holy community), embracing them within a wonderful, sacred congregation?
In Parashat Emor, the Torah reports that a man born of mixed Israelite-Egyptian descent “blasphemed the Name [of God],” was placed on trial, and was stoned to death. A law was then enacted that anyone, Jewish or gentile, who blasphemes the name of God shall be put to death. Over time, in communities throughout the world, laws against blasphemy were put in place to address curses leveled at God as well as perceived slights against some religions.