A culture of inquiry and reason, does not deem this sane in the free market of ideas anymore. It used to be it didn't matter how stupid what you said was, if you followed it with "and that's my religion" it automatically demanded respect. In the information age this is no longer the case. Ideas and beliefs are meant to be kicked around, abused, held under the microscope, and then tossed out or changed if found faulty. If you tell someone that their views on corporate regulation are absurd, then it's ok. If you tell someone that you disagree with their views of lateral gene transfer and it's effects on long term evolution, you go to the drawing board. If you tell somebody that you think that a jewish zombie saving us from a talking snake that made a woman eat an apple is dumb, then they will scream persecution and bigotry.Ideas are meant to be scrutinized, but certain ideas have had a priviledged status for so long that ones that hold them think they are beyond criticism.
It doesn't help that alot of religions have built in persecution complexes, so if somebody says "that's dumb" the recepient can immediately respond "my beliefs said you would say that, so I'm even more right! Ridicule me some more, my beliefs said you would do that too! I'm being martyred!!!!". Saying an idea or belief is dumb is not bigotry or persecution however. African Americans were hung and burned on crosses, weren't given legal rights and suffered numerous atrocities at the hands of bigots. Somebody saying "Let's debate the merits of bible's morality." or "Taking a literalist view of the bible is ignorant at best." is not persecution. But again and again this is seen as "militant" behavior, or gross "intolerance". If you think that is militant and intolerant, consider yourself lucky enough to live in a time where that can be said with a straight face.
Also, I take exception to the idea that people single out christians. This is confirmation bias at it's finest. Statistically there are far more christians on this site than muslims, of course there is going to be more discussion of the bible than the koran. I certainly don't think the koran is any more sane than the bible, but opprotunities to debate that point are few and far between. In fact looking at the topic "what religion are you" 47 checked christian, 13 checked muslim, 2 hindus, 2 buddhists, and 116 non-religious. Now just from a mathematical standpoint why do you think there are more topics about debating christianity than say...the Vedas?
Also saying "people are only willing to pick on a religion of love and peace" while claiming people only attack christians shows considerable bigotry and prejudice towards other religions. Just pointing that out.