A lot! Maybe it's obvious, but I've long thought that religion's primary function is to help people process death (and other suffering). Now that life isn't constant suffering, many of us have discarded religion, but then we are blindsided by death.

I was very religious for 30 years, and have a very religious family. I've been athiest for more than a decade now, and it's sad to me that to leave religion behind I had to give up all my family traditions to process death. Those traditions are still there, but I can't relate to them since they are based on a belief I no longer agree with