Thor 2
Philosopher
My evidence is the same as yours: general review of humans through history.
Hatred, persecution, suppression, criminalization... Look at communism. Not a theistic ideology. But it has inspired religious fervor on par with the worst of the Catholic Church. Complete with crusades, inquisitions, and even anti-popes. All done not in the name of any god, but done in the name of a religion all the same.
Even if you get rid of the theos, if you don't get rid of the religious impulse, you haven't gotten rid of the problem.
Now we are classing communism as a religion - careful you will get Karl Marx haunting you.
I embrace the religion of democracy then if you are going to play fast and loose with the definition of religion.