Was this a question? I don't think I've heard anyone ever say otherwise.
I'll add though, that people long have cloaked oppression in religion. People justified (and still justify) slavery, segregation, and oppression of women under the guise of religion, for example. Some might have been sincere (not that it justifies oppressing others), but for some the 'ultimate' authority of their God is an effective defense against any mortal criticism.
EDIT: To be clear, this is not a problem with religion in particular. I'm only discussing religion because that's the issue on the table. Thanks to chrisguilbeau for pointing that out; I agree with his comment below.