yeah the Koran is on the internet, you can read it yourself

Not my cup of tea but it's definitely a very potent book. It doesn't call muslims to arms but it basically states anyone who isn't practicing the koran is practicing a corrupt and twisted version of god's word.

Overall though it reminds me of Hinduism. If you read hindu scripture, there's nothing about a caste system, there's not really anything about patriarchy either but many rural hindu wives still throw themselves on their man's funeral pyre in hopes it'll increase their chances of being reborn as a man. The caste system developed through the misuse of philosophical study for the purpose of control. This is not the core purpose of religion, this is just the point where religion and state meet. This is why separation of church and state is so key for the protection of religion, not just to stop religious laws from becoming state laws but to stop state laws from becoming religious laws (such as the whole concept of patriarchy).