I'm an atheist, and I agree with this 100%.
Most religious moral teachings was actually a practical wisdom gathered for generations, which was simplified into "don't do this, because god said so", so that people wouldn't discuss it.
When, generation after generation, people see that excesses in food, alcohol and sex end up causing sickness and suffering, but lack a rational explanation to explain why, they end writing in their holy books that the bog man in the sky once said that glutonny and lust are sins.
Modern SJWs are godless puritans, which is an absolute mess. They believe that some things are objectively good, while others are objectively evil, yet do not being in any source of objective good or evil.