Religion was and is a major reason for armed conflicts, commonly called "war".
Religion was and is still a major factor in the denouncement, persecution and killing of humans who "dared" not to live by the fairytale books some people wrote even centuries after the alleged events without any evidence of their happenings or recorded material of any kind.
Religion receives gazillions of money by tax deductions (= your money) and the donations of the fooled. Although many countries do not require the churches to open their books completely for the public (Remember? It's your money) there is enough evidence that churches are immensely wealthy, with the Catholic Church being more wealthy than many top stocklisted companies.
And if that is not enough, Religion engages in a lot of worldly businesses which earns them more money. In the meanwhile, people working for church-related businesses are denied many rights which are commonplace for other workers in several countries.
Religion collaborated more than once with dictators of the most vile kind. The best known and most repugnant example is the Catholic Church of Germany who had signed the infamous 1933 Reichskonkordat with Hitler. The Germans are still paying a direct church tax since this agreement, the only country to do so.
Religion fücked their own, especially children and adolescents. More than once. And they use any legal and illegal trick as withholding any compensation as long as they can, not to mention direct and honest apologies towards the victims.
Shall I keep on? Whole books were written about the figments called Religion.