Question: where in the bible does it say that alcohol is a sin?
Answer: Galatians 5:19–21: "The acts of the sinful nature are obvious: ... drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God." Ephesians 5:18: "Do not get drunk on wine, which leads to debauchery.