Is it a sin for a Christian to drink alcohol?
The Bible speaks clearly about drinking alcohol (or "strong drink" as it is called in Scripture). Let's look at passages in the Old Testament, and those in the New Testament, that address this issue.
The Old Testament gave some specific prohibitions regarding alcohol. These were given for certain people under certain circumstances. The book of Leviticus, in which God instructed His people about acceptable service in the Tabernacle, clearly prohibited the consumption of alcohol for the priests during service in the Tabernacle.
"Do not drink wine nor strong drink, thou, nor thy sons with thee, when ye go into the tabernacle of the congregation, lest ye die: it shall be a statute for ever throughout your generations." (Leviticus 10:9)
Another commandment prohibiting any consumption of wine or strong drink was given specifically to those who took a Nazarite vow.
"Speak unto the children of Israel, and say unto them, When either man or woman shall separate themselves to vow a vow of a Nazarite, to separate themselves unto the LORD: He shall separate himself from wine and strong drink, and shall drink no vinegar of wine, or vinegar of strong drink, neither shall he drink any liquor of grapes, nor eat moist grapes, or dried." (Numbers 6:2-3)
The only mention of forbidding wine or strong drink in the Gospel accounts is in reference to John the Baptist. When the angel Gabriel spoke to Zacharias, He proclaimed that the baby, which Elisabeth was carrying, would be named John and that John would be under the Nazarite vow, which included abstaining from wine.