There is no need to believe in evolution just as there is no need to believe in gravity; both are observable facts. On the most basal level, evolution is the changing of gene frequencies over time. This is an observable fact, not something that requires suspension of disbelief. Go back to Hardy-Weinberg. Once you understand that we can readily demonstrate (and reproduce the result) that population genetics shift over time, it should be clear that evolution is occuring all around us. I believe the difficulty for many people comes from the introduction of geological time scales. Our brief existence of ~80 years, and what little we can observe during that time, is so insignificant compared to approx. 4.5 billion years since the formation of planet Earth. Take those small, observable changes in genetic frequency and compound that over billions of years. Even events with seemingly impossible odds can occur many times within the span of billions of years. The odds of an individual being struck by lightning in the US are approximately 10^-6 every year. The odds of being struck within your lifetime, ~80 years, is 10^-4. Just because you haven't been struck by lightning doesn't mean that it isn't occuring all around us.
Source (
http://www.weather.gov/om/lightning/medical.htm)
A proper scientific question is one that is testable, repeatable and disprovable. The scientific method doesn't explicitly prove anything--it only makes explanations more likely as repeated experiments fail to disprove a theory.
Did an omnipotent being create the universe? Perhaps, but it isn't a question which belongs within the realm of science. It has no testable hypothesis nor results which are repeatable.
A reading assignment for those who are still confused: "Why Evolution is True" by Jerry A. Coyne.
