Consider that literally all of those things can also be applied to political parties, and the way people talk about Dems and the GOP they should be at this point. Whether murder is committed by a Christian or an atheist, Republican or Democrat, it is still illegal and the victim is still dead. You don’t need religion to be a white supremacist or anti-LGBT or in any other way oppressive, and any high-school misfit can tell you that. I know many great scientists who are very religious, and atheists who are for some goddamn reason antivax.
So there you go. Laws already cover murder and people who are inclined toward tribalism and in-crowds will find ways to be tribal and exclusive.
Religion, however, is quite often cultural, sometimes racial, sometimes in one’s family going back thousands of years. It can connect us to our past and family history in profound ways. For some of us it’s a core belief that’s part of who we are and we couldn’t leave it behind if we wanted to. My religion is just as much a part of me as my belief that abortions should be legal in all cases, women and nonbinary people should be paid as much as men and treated equally in the workplace, and different marginalized groups face unique issues that need to be addressed in order for them to achieve equal footing in society. I can’t just decide not to believe any of those things. I’m glad they’re protected and I don’t have to try.