Because if you can get enough people to believe a ridiculous story, you can get them to believe anything. Someone came up with the idea of a man taking two of every animal and putting them on an ark, even there is no scientific evidence of a global flood. You believe that a being created the entire universe in six days. Christians say they accept the Bible, when most of them don't even follow its laws. Hell, as the next paragraph will show you, the Church doesn't even obey its own bible.

Christians were committing these acts in the first place. The Church commissioned the Inquisition. The Jews were expelled by the Christians, who wanted to expel any non-Christian from Spain. The Church ordered the burning of books deemed "anti-Christian", and burned anyone who wasn't Christian to the stake. Ideas were suppressed if they didn't agree with the Church's views. And the amazing thing is that before 300, Christians were the ones being persecuted for their beliefs. If it wasn't for Constantine, your beliefs wouldn't exist anymore.

It was when Renaissance and Enlightenment thinkers started rejecting traditional religious views that we started progressing. During the Renaissance, science, art, and ideas flourished, and we started studying things we could in depth, such as the earth, space, the ocean, numbers, etc., as opposed to a spiritual being whose existence cannot be proven by any means.

During the Enlightenment, we had thinkers who encouraged democracy, no set class system, and a massive increase in the amount of educated people. It marked the point right before the Industrial Revolution, when people started manufacturing goods and technological advances started increasing faster than they ever had in history. In a matter of 200 years, we went from a society who had no means of distant communication except talking, to a society with cell phones, computers, televisions, radios, and much more. We made it easier for massive amounts of goods to be produced in a matter of a day using machines, as opposed to weeks when made by man.

And this is solely because people decided to think for once. Faith makes no sense. It tells people to accept things the way they are. People used to think bleeding themselves would cure their diseases. Now we know that diseases are caused by different types of bacteria, viruses, and genetics. If we kept accepting things the way they are, everyone would be cutting themselves to try and cure AIDS.

And you can check my claims. They are completely, 100% historically accurate.