Religion, is not inherently good or evil. The tenants of Christianity are love, acceptance, forgiveness, generosity, taking care of each other. Even the old testament made provisions for equality under the law for the foreigner and the poor.
Yes, its highjacked by people, to do other things. Just like someone might pick up an axe, that is made to cut down trees, and lop off heads.
Would communism fall in as a religion? In the past hundred years, extremism and politics have killed more people than anything else. And fun fact- perhaps in WW2 the Catholic church was complacent, but it is by no means infallible. It is a human organization, just like every other organization.
Made by God perhaps, but run by Man.
And for the Catholic church being complacent in WW2, you had Christians and not, smuggling Jews away from the Nazis. The Danish resistance ultimately meant that 99% of the Jews living in Denmark survived the war (mostly by smuggling them to Sweden).
The Catholic church spends more than anyone else on providing health care, particularly for AIDS/HIV in Africa. Thats some pretty big fucks given.
The point that religion is tribalism still stands. I can argue that is the worst form of tribalism there is. You can find all the examples of people doing good in the name of religion, I can give you tenfold reasons why humanity would be better giving up indoctrinating people in irrational dogmas that divide us much more than unite us.