Who told you you were the one deciding what’s moral and what isn’t? Just because objective morality doesn’t exist, doesn’t mean morality at all doesn’t exist. Your argument is flawed from the start. But hey, you do you, if existence of god is the only thing stopping you from being a total psycho then keep on trucking buddy.
Because “morality” comes from what you have been taught as a child, and what is acceptable in a specific society / country. Hence why Americans do shit that is considered immoral in Europe and vice versea. That’s why there are people who actually do the things you said you wanted to do in the posts above. That’s why bloodthirsty dictators exist. That’s why people who grew up in different environments have different values. What’s immoral to the Amish will be moral to a Muslim. But you, a single random person don’t get to decide “from now on we do XYZ”. XYZ needs to be accepted in society to then be taught to people further and instilled over generations.