Just look at the mass delusion of religion, it's the embarrassing dark age fiction through which people put faith in and justify their actions. As cognitive and behavioral imperative, religion was born to understand the phenomenon of the nature. It was built around the primitive knowledge and has intermixed the myths and facts with the deep human experiences. With the more and more use of logic in ours quest for explaining nature, we observe religion on a hundred fronts losing the argument with science. Also, a class of people have become priestly clan in the religious camps and grow on the basis of collective fear and paranoia of masses. Thus, religion became authorizing in its claim of knowledge and truth, and there starts its fall.
What can be canceled, logically, must have once had value. And thus, there can be reforms with new generation as new logic will emerge on the basis of time and new human experiences. That's why fraudulent practices or wrong theories are corrected in science through scrutiny with the time. When the religions are aware of the limits of their claim to the truth, when they allow doubt, the chance of reforms develop from inside.
Religion does not grow in the ideology that continuously goes through scrutiny of several groups and individuals. Any ideological bias can be extreme, but they are backing it with the reason. Logic is there in the development of all these ideologies. What mankind often does with religion is often more self-serving and abominable as they are mere unproven beliefs. They are treated as factual by many religions and the extremes to which some followers have taken them. Religion takes the path of extremism without any basis of reason.
Nadeem F Paracha summarized about Extremism extremely well: Extremism is nobody’s friend. It only deals in might gained from coercion. It does not rest after it has defeated its ideological opponents because then it goes on to destroy even those supporters whom it deems too soft or moderate.
Perhaps the world can come to realise that the real war is between those who believe in the ultimate sanctity and value of a human life and those who do not. If you are not willing to seriously investigate your faith and ask questions, then you are at the mercy of others who will define it for you. Isn't searching for truth personally better than bracing false hopes in existing answers? Science, constructive doubt and investigation are the tools while faith is positive suspension of critical thinking.
I will produce here a thought about Dharma perceived by Buddhist monk: Excessive faith without sufficient wisdom leads to the blind faith, while excessive wisdom without sufficient faith leads to undesirable cunning. Too much energy combined with weak concentration leads to restlessness while strong concentration without sufficient energy leads to indolence. But as for Mindfulness (sati), one can never have too much of it, it is never in excess but always in deficiency. We need to cultivate Mindfulness.