Is the theory of evolution based on fact or observation?

So many people put so much faith in the Theory of Evolution. I'm just wondering if people really think it's based on fact or not. Christians are accused so much of "blindly following" what their pastors tell them the people making the accusations never stop to wonder if they are being decieved. Observation is biased on the soul fact that there is an observer. I understand there is a system of checks, but no more than there are in the spiritual community. I think it is inherently dangerous to simply accept what you were taught in school as absolute truth. Evolutionist, try thinking for yourselves. Yes science has done some amazing things. Physics for instance has improved the lives of many. But physics is something we can observe right here and now. When studying life origins you will have to make umptions and to estimate. It's in the genes.