I dislike Islam because I'm a lefty liberal. I agree that it's the height of intellectual dishonesty to throw all your weight behind efforts to support civil rights, gay rights and feminism but then defend a religion which seeks to undo all the progress we've made in these areas. We need to remember that while religion may try to present itself as friendly and harmless in secular democracies whenever it has had any amount of power it has sought to enforce regressive and damaging policies. Is it coincidental that since the Russian Orthodox Church has regrown homophobia has become part of Russia's legal system? Is it a coincidence that wherever Islam is a fundamental part of the government women have far fewer basic human rights than men?
The left should oppose Islam in order to defend all the progress we have made. But some of us are clearly just oppositionists. Some of us insist on sticking up for the little guy, even if the little guy is a misogynistic, homophobic and hateful religion, many of whom want the entire Western World to be annihilated.
Of course most muslims are better than Islam wishes them to be. Even if a religion is utterly hateful people's humanity does break through it. I met a muslim girl recently who is a western feminist, hates the hijab/burka and thinks that if Allah has set these laws then human beings' attempts to enforce these rules is an attempt by humans to displace Allah, which she considers to be far more haram than anything the Qur'an prohibits. If all believers had that same attitude the religious debate would be limited entirely to philosophers and wouldn't be of any interest to anyone else. It's only because it actually affects people that the god hypothesis actually matters.