This was largely demonstrated to be a ruse by so-called "Intelligent Design" proponents in the Kitzmiller v Dover trial[0].
I would respectfully suggest that you haven't really looked into the evidence that carefully if you question the degree of rigor that underpins evolutionary science.
Large parts of evolutionary theory are indeed based on circumstantial evidence. But the quantity of such evidence is so overwhelming[1] that questioning its explanatory power is rather foolish. It's the sort of evidence where coming up with any alternative hypothesis besides evolution quickly becomes an exercise in futility. Unless, that is, you don't care if the hypothesis is testable or not, in which case creationists have many.
Moreover, evolution does not only have circumstantial evidence. You and I are living through the rise of antibiotic-resistant bacteria - an evolutionary change that is being observed and documented as it occurs. Fruit flies from the same species have been split into physically isolated groups, allowed to breed over many generations, and subsequently reintroduced, only to discover that they had become reproductively isolated.
There's more evidence discussed here:
https://en.wikipedia.org/wiki/Evidence_of_common_descent
Or here:
http://amazon.com/dp/1416594795/
Or here:
[0] https://en.wikipedia.org/wiki/Kitzmiller_v._Dover_Area_Schoo...
[1] For example, here's Wikipedia's list of transitional fossils (so-called "missing links" between divergent extant species) https://en.wikipedia.org/wiki/List_of_transitional_fossils
[1] http://www.talkorigins.org/faqs/comdesc/
[2] http://www.amazon.com/Why-Evolution-True-Jerry-Coyne/dp/0143...
[3] http://www.amazon.com/The-Greatest-Show-Earth-Evolution/dp/1...
[4] http://www.amazon.com/The-Ancestors-Tale-Pilgrimage-Evolutio...
http://www.amazon.com/Your-Inner-Fish-Journey-3-5-Billion-Ye...
http://www.amazon.com/Endless-Forms-Most-Beautiful-Science/d...
http://www.amazon.com/Making-Fittest-Ultimate-Forensic-Evolu...
If interested why, there’s lots of reference material:
https://www.amazon.com/dp/1416594795/ref=cm_sw_r_cp_api_i_.F...
https://en.m.wikipedia.org/wiki/Evolution