Criticizing a religion is no more a criticism of the individual believers than calling a national government (like the Russian one maybe) evil is equivalent to claiming all who share that nationality are evil.
If one is to this then they must make it clear which the original commentor did not. They did not say "the religious hierarchy within islam is oppressive in order to preserve existing structures of power", they just clearly implied Islam is intolerant without any addition of context. I believe my interpretation was reasonable within those bounds.
I also encourage you to look into how Bedouins treated women before Islam. Or anyone for that matter, it was often unpleasant to be a part of their society and Islam made their lives better.