You may find this book interesting because it talks about Progressive Christians and how many were pushed out of Christianity and "othered"
I agree with you that Christianity and religion as a whole has been used to do some of the most atrocious things on Earth! But there has been sects of Christianity that fought for progress. If it weren't for the Black Church then we wouldn't have had the Civil Rights Movement. There were also progressive Jewish people and Catholics that fought for our rights in this country.
I will say in our country that when one thinks of the Religious Right we think of Protestants mostly. This is a bit of an erasure of Christianity and those who are more left leaning and fought for human rights, equality, etc.