iano
Given that science is complex, how could anyone be sure evolution was true without achieving the necessary degree of education and experience which would allow them to evaluate for themselves the complex evidence involved? If the answer is they couldn't then...
The layperson accepts much at face value and this is true of even experts in one field who try to venture into the expertise of another field.The best one can do is if one disagrees with a given aspect of an issue is to educate themselves to the level of commitment that they have.If,after all that,you are still disatisfied then you will remain disatisied.
This is not a failure or success of the theories or facts but a failure of the person to commit to the hard work necessary to rise to the intellectual level necessary to argue a position.
One might point out that technology that is succesfully deployed as a result of the theories is ample backing for the success of a theory's validity.Most of modern medicine {bdepends[/b] on the validity of Evolutionary theory to account for its ability to cure ills and improve life for people.
So the best you can do is to question and raed up on the means by which conclusions are reached and remember that doubt is a good thing,not the only thing.