How about this...if I find it in Scripture, I believe it. If it conflicts with Scripture, then I don’t. Better?
Slightly. The problem is, of course, that many times the judgment of whether or not something "conflicts with Scripture" is subject to interpretation -- necessarily so, because things we encounter in our daily lives have no direct counterpart in Scripture.
The question in that case is, do you believe your interpretation of Scripture? What if my interpretation differs from yours? Given that Scripture is not directly on-point in such cases, on what basis do we decide which interpretation, if any, is closest to true?
There are a number of practical difficulties with the principle of Sola Scriptura (which is the traditional term for what you've called "biblicism").
Theologian Bruce Metzger offers the following very interesting discussion on the problems inherent in taking the Bible literally (however you define the term); and he also refers to N. T. Wright's wonderful discussion, How Can the Bible Be Authoritative?