Then why are there conflicting theories? Some scientists believe one thing, and others another. Grief, just deal with it, man.
What conflicting theories are there to the theory of evolution?
Do you have any examples in mind? Are you sure they are theories and not hypotheses? When theories have been in conflict, the one that offers the best explanation usually wins out. However, Newton's theory of gravity, for instance, is not conflicting with Einstein's theory of relativity, but is incomplete by comparison. It is still very useful, but it is limited in scale.
You are still confusing believe with accept. Some scientists may place more weight on some evidence compared to other evidence or one hypothesis over another, but it is not based on belief. They offer reasons for doing so. Of course, scientists are human and human bias can come into play for some people, but to leap with that to equating science with belief is a last ditch, desperation play with little to support it. Since bias can be eliminated by self-correcting mechanisms within science.
Now, there are scientists that do use belief as a component of the work they try to do and this is recognized. Intelligent design and creation science are noted and recognized pseudosciences where those trained in science have tossed out that training and are not doing science. But they are not believing the science, but substituting unsupported and subjective belief as a mechanism or a cause for the observations.