Religion is often a smokescreen to dehumanize others and not have to feel bad about it. Because if you’re religious then you’re good, and a good person can’t be guilty of bad things if they are done in service to their religion.
The power hungry will say absolutely anything that gives them more power, and if some people believe nothing is more powerful than God, then the power hungry will claim to act in his name to accomplish their own selfish goals.
Honestly, if the devil was real and had intentions to corrupt people, religion would be the ideal tool to accomplish his goals.