Most hospitals have social services offices, or can connect you to a county or state agency. I suggest you start there. Let the experts talk to your brother. If he's a danger to himself and society, they'll get him placed. If he is not but expresses a desire to get clean and sober, they may be able to help him as well.
HE has to want it. HE has to take some steps. You're right in my opinion, God WILL hold his hand. But your bro has to want to be led.
I will pray you find some peace in your heart.