Hi, I understand that this is a highly controversial discussion and so please don't get angry if you're religious haha. Just remember as Aristotle said "It is the mark of an educated man to entertain an idea without accepting it."
So, given the Old Testament especially, wasn't God responsible for ordering the murdering of more people than any other authoritative figure in history ordered? God also told Abraham to stick a knife in his son's chest as a test for loyalty. And let us also not forget the endorsement of slavery where people did indeed get beaten too btw. And in Islam it was permitted that Muhammad had married a six-year-old, and then had sex with that 9 year old. In Islam, it was/is permitted that homosexuals are condemned to death, women are inferior to men, and so on.
And what was the Devil's only crime? To be the Archangel that opposed God. Maybe the true God was the Devil after all?
Who seems like the friendlier guy here? God or the Devil?