The resurrection has been claimed as historical fact for centuries and the Jesus as myth theory is not mainstream.
Nice bit of ramming two completely distinct elements together.
Just because people have believed in the resurrection for centuries doesn't mean that it is true, nor that their belief is based on evidence, rather than ... err ... belief!
But also it is perfectly reasonable to accept it is likely that a person called Jesus lived at that time, but also completely reject the biblical claims. Actually we have virtually zero evidence for the historicity of Jesus at all, but I and I suspect and many of us here would probably accept, for the sake of argument, that there was some historical person. What we do not accept, and will not accept without credible evidence is the miracle claims, the resurrection etc etc. So what we are left with is a guy who probably went around teaching for a while and then died - so what.
So don't try to ram these two elements - thinking that Jesus probably existed doesn't mean accepting the biblical claims whatsoever.