How do u think Christianity became the main stream religion in the west? Fear and propaganda. Between 5th~17th century Catholic church hold indirect dictatorship to Europe, through controlling the Kings. They use religion to secure their power, they use fear, to convert people to become Catholic, anybody who isn't a Catholic and does not follow Catholic doctrine, is executed, been burned alive, they kill anybody that contradict the church or its thinking, eventually Christian value became mainstream in the west, despite it is highly corrupted and got many problem. After the 17th century, the Catholic Church fall and people started moving away from Christian value, but because it is still the only religion in the west, for the past 1000 years, most people are still Christian, but with every passing generation, people started following a more reformed, to be more humane version of Christianity. although it still got many problem. If u open the bible, u realized the real Christianity is literally no different from ISIS. Some churches today, their bible, actually took out, certain biblical teaching, to make their version of Christianity, less ISIS style. But some churches are still teaching certain more ISIS style Christian value and there are still those who follow those churches, for example we see some people going on angry protest saying "god hate fags"
In fact, the god of Christianity, Judaism and Islam, originally isn't even a god. The real god is Satan. The word Satan meant challenger and against, it was used by early worshiper of a Yahweh cult, to refer to other gods. Yahweh would eventually become the god of Judaism, early Yahweh cult is 110% ISIS style, the treat led ancient Babylon to conquer it, after they failed to conquer Babylon. Babylon order the tearing down of Yahweh temples, but the cult become a religion of words, thus, turned into Judaism, which later led to Christianity and Islam, Why Arabs would convert from the peaceful pagan religion, to the bloody Yahweh cult, is beyond me, but at least, the 1st and 2nd Islamic Empire, follow a pro humane interpritation of the faith, so does most modern Middle Eastern countries.
We need to convert people away from the Yahweh cult and back to becoming pagans, not the opposite way around.