We can't allow people to believe whatever they want.

If your argument is just to let people believe whatever they want, then there is nothing you can say against the Westboro Baptist Church, Scientology, or suicide bombers. These people actually believe that what they are doing is good and right in the eyes of god. There is nothing you can say against people who refuse to vaccinate their children or seek medical attention for completely curable disease because they believe god will cure them. There is nothing you can say against people who believe stoning someone to death for premarital sex and adultery is completely justified. I could go on for hours compiling this list, but I hope you get the point by now. 

Believing in something that would otherwise be thought insane, were it not protected from scrutiny by the respect we accord religious faith, is a direct result of not criticizing bad ideas. If you don't think this is a serious argument with global ramifications for the future of humanity, you are simply mistaken. While your idea of faith may seem harmless on the surface, I assure you it is anything but. As I've stated elsewhere, the 'extremism' vs 'moderate' view simply does not work. Religious extremists are just better at their religion, and believe more deeply that god is truly on their side. People who kill gays or blow themselves up on buses are often perfectly normal people driven to psychotic behavior because they believe with conviction they are in the right. Stop pretending people don't actually believe these things, or that this behavior is solely the result of economic desperation or a damaged brain. It isn't. Religious people of the world are telling us, ad nauseam, that they really do believe in some very crazy and dangerous ideas, and that we are not allowed to criticize their faith. This is a problem. 

And hyper-sensitive liberals in the west are just as much to blame for this as anyone. Those of us who live in secular societies appreciate the centuries-long struggle and commitment it has taken to stop religion from running our lives. Why then do you kowtow to those whose views and morals are in complete opposition to your own? There is no room in modern, secular morality for acceptance, tolerance, or respect of beliefs which fly in the face of that very morality. How dare you say you support gays and women's rights, and in the same breath defend religions and people who torment and kill homosexuals, and force their women to live in cloth bags as illiterate baby-making machines? "Respecting" religion gives these people license to get away with far too much, and you are giving up too much ground that countless others fought and died for. Our secularism was born in the renaissance and in the revolutions of the 18th century against the divine right of kings, which for centuries was propped up by religion. We have long since emancipated ourselves from the shackles of ancient barbarism. But when you take offense on behalf of people who would love nothing more than to see your secular morality replaced with religious law and send us back to the Iron Age, you epitomize hypocrisy.