Sadly, most minorities have learned to depend on, but not trust whites. Consider colonialism, the slave trade, over 200 years of slavery, Jim Crow South, lynching, and all that it entails, etc. So, the religion and culture become sacred to these people when there is virtually nothing else.
Also, when feminism first surfaced it was about privileged American, mostly white, women saving the poor third world women from themselves. The intent was genuine, but the assumptions that everyone would comply was wrong. Even when black feminist, Alice Walker, condemned female circumcision in Africa, she did not take into consideration that all these people knew was their religion and culture. the women victims of 3rd world countries believe they are supposed to be treated the way they are treated. And outsiders are threats, especially outsiders who rule and subjugate their lands. Would you trust a white person when everything you associate with them has to do with subjugation, theft, injustice, etc? Every continent I can think about, including Europe, has been conquered by European imperialist ideology
For the record, I am for you, not against you, and I am black. I wish people wouldn't be so quick to generalize either. Assuming a white atheist is racist is no better than making assumptions about blacks.
They have to know that atheism in itself isn't against brown or black people, but the immorality and dishonesty perpetuated in their religions.
Don't take them personally.