Is it okay to leave Islam?

Which punishment are you afraid of, that of God or that of your fellow Muslims? If you leave Islam, have you come to realize that it was indeed a fake religion? In that case, if its a fake religion, then its Allah is fake also, therefore no fear of punishment from a fake god. But your fellow Muslims will surely be angry and because their ruthless prophet Muhammad said so, people leaving Islam will be killed. Since Islam is fake, then all its claims including afterlife are fake also.