Send one last text apologizing saying you need to reevaluate your life and what is and is not acceptable for you to be “joking” around about with her. you will keep this humor (which I’m hoping is all in jest and you’re not actually anti Semitic) to your self. You took it to far and this will never happen again. Unless you want to be able to joke like this with a partner, then you did yourself a favor. If not, atheist or not. Boy, you better start praying