There are no viable alternative scientific models that compete with the theory of evolution in terms of explaining change across successive generations of biological organisms. There are theological models, but those by definition do not have any scientific evidence. Which is why doubting evolution is considered anti-scientific - rightly so, in my opinion.
The amount of hard evidence we have for the theory of evolution is so overwhelming at this point that doubting it has two possible reasons: the person either does not understand science in general and evolution in particular, or they are driven by a religious agenda. Incidentally, both of these are very common in America due to shoddy science education (esp. with regards to imparting critical thinking skills in children) and the influence of religion in politics (and therefore education).