Is Alcohol A Sin In Christiandom?

Is alcohol a sin?

This particular topic has been bothering me, i once asked a Rev Father, who said its not a sin.

On the contrary i met another man of God(prophet) who said alcohol has an evil spirit in it, it has demons that controls who ever takes it.

But on friday, my cousin who happens to be a prophet came around and has been drinking Williams(beer) comfortably from my fridge and he said neither can alcohol stop his gift of prophecy nor possess him with demon.

I really need help concerning this topic and scriptures to back it up.

#thanks