It is absolutely incorrect to say that it is not consistent. It is very difficult at times and requires great study, but it is consistent. Give me the exact passage if you desire, so I may view it, but I would suspect that any perceived inconsistencies could be explained. For example, just b/c one author says his head was annointed with oil and another his feet doesn't mean they are necessarily inconsistent. It is very possible that both were, and each particular author only told part of the story. Matthew, Mark, Luke and John, in the Gospels, each had a different audience they were targeting, so they recorded the events as they were important to their audience. (Here are the aspects each author dealt with: Matthew - Christ as King; Mark - presents teachings of Christ; Luke - presents Christ as a suffering servant; John - Christ as the Messiah). Because of this, it is actually consistent that one would focus on the annointing of Christ's feet and the other His head - one does not preclude the other.
The Bible is to be taken literally unless it is obvious from the context that it is to be take figuratively. Most people want it to be taken figuratively because they are uncomfortable with the literal meanings of the Bible. There are things in the Bible I am uncomfortable with also, but I try to understand those instead of only taking the parts which are convenient for me (and believe me when I say I am sinful and have difficulty being a truly Good Christian and I fail miserably often).