Now if only we could distill the good from the unnecessary belief in the supernatural
I can appreciate this, but i do not think that most modern persons understand or appreciate the great power for good which religion/spiritual expression has been for humanity, from cromagnon man to the modern age.
Prior to a couple of centuries ago, science and knowledge had almost nothing to offer humans for comfort or betterment of life, but religion has offered hope, release from pain and suffering, a sense of purpose and belonging, etc., to humans for at least 50,000 years. It has given us an essential ingredient for human security; IE a rational explanation for all that was inexplicable given the knowledge of the time. Sure the rational explanation was incorrect because it lacked sufficient knowledge /data, but still it gave people a sense of safety, security and order, when science could not.
Only in the last few generations (At least in my family time frame. My grandmother was born in about 1880.) has scientific knowledge and understanding been able to offer anything equivalent. So we cannot judge past religious significance or value from within a modern perspective.