The Bible, in addition to being based on the strange customs of a rather primitive tribe 2000+ years ago, also contradicts itself and offers advice that is just plain silly, such as the ban on wearing a fabric made from different fibers. I assume that the Ba'alites or some other tribe were fond of lindsy-woolsy or something like that, and the Hebrews were admonished not to support Ba'alite (or some other tribe's) weaving industry by purchasing such cloth. But it makes no sense today. Punishing your disobedient children by stoning them to death is certainly effective, but a tad harsh in anyone's book. In one place the Bible states that interest cannot be charged on money lended, in another it states that this is okay. In one place, the Bible states that a man may not marry his brother's widow, in another it suggests that he must.
A true fundamentalist would be driven mad by a real attempt to follow each adminition at once, and probably thrown in jail for child abuse, wife battering and numerous antisocial activities. The thing is that it is written in pretty turgid prose, so most people just don't understand what it indicates that they must do.