I know two religions very well indeed – Christianity and Islam. I honestly cannot comment on any other religion with regards to sexual discrimination.
If we compare the respective holy books – the Bible and the Koran - we find two highly misogynistic documents, both being obviously written my men and which denigrate women as being little more than chattels. Examples of gross misogyny are the Koran's assertion that a woman's evidence in a court of law is worth less than a man's and the Bible's assertion that wives should be subservient to their husbands. Both of these apparently holy books contain a plethora of discrimination based on sex.
The question really should be about how these holy books are interpreted. For instance, it is often said that the UK is a Christian country, built and run on Christian values. Is this true? I don't see much evidence for this. We have laws which have been made specifically to ensure that women are not discriminated against because of their sex. We don't stone homosexuals to death for their 'crime' of being homosexual, nor do our courts consider the evidence of a woman to be anything less than entirely equal to that of a man. A husband doesn't own his wife – the partnership is equal, both culturally and legally.
When we look at countries run on principles established in the Koran, we see a very different story. A great deal of Islamic countries still adhere to the teachings of the Koran; homosexuality is both illegal and punishable by death, a women's testimony is not equal to that of a man's and in some countries it is even forbidden for a women to walk the streets without a male escort (this is ostensibly for her own safety but is in reality a method of subjugation).
Christianity is not – when taken at face value – a very pleasant religion. Thankfully, the Bible is very rarely taken at face value and it's excesses in western countries have been curtailed by legislation that protects the rights of the individual (regardless of sex or sexual orientation or religious belief) and prevents the barbaric, dark-ages thinking that prevailed at the time of its writing.
The same cannot be said of Islam and the Koran. The countries whose government's practice Islamic law employ all the barbaric and misogynistic punishments that are prescribed in the Islamic literature – from hanging homosexuals to stoning female children for being raped.
http://news.bbc.co.uk/1/hi/7708169.stm
In short, the answer to the OP's question is - Islam.