Your story isn't unique. The volume you consume, it's clear you're a pro. I used to hit the mouthwash and the vanilla extract myself. You're one of many.
Nothing changes if nothing changes.
You have to do something or you will die. It's that simple.
I'm not sure where you're at, but you could look into a county or municipal detox center.
Your atheism is irrelevant. There are plenty of atheists who are in AA that practice the 12 steps. You don't have to believe in God. Stop making excuses and do something.
Go to AA, ask for help. Even if you know you're going to get drunk later, go anyway. Ask those there for help finding somewhere you can detox under medical supervision for someone in your financial situation. They will know where you can go. They are the experts.
It's okay if you don't agree with the principals or think it won't work for you. Keep going. If nothing else, fake it until you make it.