The statement "[Islam] is a religion of hate, misogony, and violence" is a generalisation and it is offensive.

As such, the reason given for the warning is correct. As far as the warning you received goes, I don't see why it should be reversed.

As for your more general query about Org policy, if you encounter offensive posts, you can always use the "report post" function and staff will deal with them.

I can assure you that a similar post about Christianity will be treated the same way.

As you are well aware, warnings are given in private. It's not because member X did not open a thread complaining about a warning received for e.g. Catholics-bashing, that such warning did not occur.