Question--if we take original sin out of the equation, does that alone change the importance of the death, burial and resurrection theology of much of the church today?
Perhaps. But to me, the largest mistake made by the church was when the Council of Nicaea decided to deify Jesus. By in essence making Jesus god and essentially merging the two entities together (whom were previously distinct), it actually diminished the sacrifice.
Jesus being a honest and true mortal actually makes his sacrifice far more profound and makes his suffering and desire to die for his beliefs that much more relevant. The moment he is deified, it takes away from the action.