Religion is not a cursed but blessing, it's only the devil that makes men to see religion as a cursed because his intentions for humanity is good. Religion was meant to unite people together and draw them closer to God, but the prince of the world has turned humanity against it Creator, it's only those who don't know the plan and agenda of the devil will see religion as a curse. Religion was meant to be one and not to be divers, but the prince has made people confused about the right religion that's why people see it as a cursed. When you follow the right religion which is Christianity you will know that religion is not a curse.
Nothing concerns the devil, humans are the ones taking it too far. The problem started with trying to convert a person from a different religion to their own religion, if everyone could focus and practice their religion, i believe the world will be more at peace than it is today.
In Nigeria we have a terrorist organization of a particular religion, their aim is to make the country a one religion country, this is what religion has done, and honestly, from a good point of view, religion does seem like a cursed blessing.