No. This site neither assumes that the Bible be considered 100% true nor requires participants to do so. Remember this is a secular site.
The constituents of this site are another matter!
The views expressed in answers belong to the people who write them, and sometimes they represent some larger group or tradition. I personally believe that the bible is inerrant, but not everybody here will agree with me.
For example it would be perfectly valid to ask a question about the doctrine of inerrancy itself. In fact when I first saw your question title I thought you mistakenly posted something on meta that would belong on the main site. (Because of that I edited your question title so it would be more clearly a meta-question. Hope you don't mind.)
In answering questions, you are welcome to espouse whatever view you like. I think you will find the voting system is much nicer to you if you clearly identify what view your answer claims to represent. Answering a question about a scripture passage with "my opinion is X no matter what verse Y says" is likely to be viewed with some suspicion in a community where the "experts" are mostly professing Christians. However if you explain in an answer how you propose another view on an issue based on consistency with some other passage (or even text if, for example, you are JW or LDS), translation issues, or whatever, it is perfectly on-topic and allowed here.