Religion is rubbish because if you can be persuaded that there is a supreme being who made all things and has a heaven for those who do what he/she wants, then you can believe anything - even believe that this supreme being wants you to kill people who do not believe what you believe.

This is your one life. You might not like it all that much but make the best of it. Get along with other people. Do not kill them. It is all we've got. There's nothing beyond, after you're dead.