The Christian religion is unlike many other religions in that its foundation is not based on some ethereal truth that is found in the supernatural world. Rather, it is based on a single event that physically happened in the past. The resurrection is a historical event that transpired in the physical world and so it is investigable just like any other event in history. If this historical event is found to be false, then Christianity is false. The evidence by which we go about testing the veracity of the resurrection is found in the documents of the gospels.