http://www.china-embassy.org/eng/zt/zjxy/t36492.htm
I know it's over a decade old, but the extent of their religious oppression is saying those of religion can only be of Buddhist, Taoist, Islamic, Catholic and/or Protestant faiths.
Not only that, but you have to belong to the
government approved branch of each of those religions, and have your specific beliefs subject to scrutiny and approval.
Obviously there is some oppression there because noone can organise a gathering to worship Hinduism or any other religion. But essentially if you're Roman or Greek Catholic, you just say you're Catholic, if you're Sunni or Shia, you just say you're Islamic. Some oppression but hardly militant.
Except when you consider that any form of protest against this oppression is met with intimidation, if not outright violence.
In fact I see it as a great way to harmonise intra-religion hostility, seriously if you were Shiite and the only temple in 1000kms was Sunni and you were truly religious, would you forsake going to that temple just because they give more importance to a single text than you do?
Religion doesn't work that way - a religion is a holistic ideology that needs to be expressed and understood in its entirety. It is much greater than the sum of its parts which is why religion isn't able to be analysed piecemeal. Every part of it needs to be considered in context of the rest. This is why artistic and social thinkers have always had more success understanding religion than scientific minds have.
Therefore if you feel those people are perverting your religion, despite it being 'sort of' like your own then you're probably not going to feel comfortable experiencing their religion with them. In many ways it's similar to the uncanny valley of robotics, and why the hostilities within a religion can be more vicious than those between them.