I think it's really important to realize how many denominations of Christians there are. There is no such thing as "The Christian Church." That's really critical.
The Catholics have an overriding authority in the Pope, the Mormons (LDS) have a firm hierarchy, the dozens of Protestant denominations have varying degrees of strictness (some have bishops, some don't), the evangelicals and Pentecostals have a different structure, and so on. There is a HUGE spectrum of beliefs, interpretation of the Bible (degrees of literal view vs. interpretation), varying views on everything from women clergy to saints to dietary laws.
The same thing applies to Judaism and Islam and many other world religions - you can't really say "All ______ believe in X and Y." There are thousands of translations of the Bible into English alone, and thousands more into other world languages. A few are directly from the original Hebrew, and most are translations from the Greek translation of the Hebrew. Even those who study in the original Hebrew (as Jews do and some Christians) find that there is disagreement and there are many viewpoints on what certain passages mean. (In Hebrew, we even look at the 3-consonant root of the word in question, and even so, there's discussion and commentary.) Now multiply that times all the words in the Bible! And there are tons of obvious contradictions in the Bible - there are 2 sets of 10 Commandments, there are 2 creation stories, and more.
So really what people are saying is "This is MY interpretation of Scripture" or "This is the viewpoint of my Pope/Bishop/Pastor/Priest/Spiritual Leader."
Most people, even those who consider themselves literalists, do pick and choose among Bible verses. Technically, if you're following everything in the Old Testament, you're not eating lobster or shrimp, you're not wearing any garments made of wool and flax/linen at the same time, you're a believer in animal sacrifice, and you're never ever eating a cheeseburger because you aren't having meat and dairy at the same meal. You think animal sacrifice is the way to go, and you think it's fine for men to have multiple wives or relationships with their servants, like Abraham and Jacob. So really, EVERYONE is a revisionist in some ways!
I think you look at whether you're doing anything in excess or for the wrong reasons. If someone avoids alcohol but winds up treating people shabbily and disrespectfully, they are far less of a religious example than someone who drinks wine, and benefits humanity.