Nope. The whole point of developing the Raptor Engine was (A) to be able to reuse it and (B) to refuel on mars (using the Sabatier reaction with atmospheric CO2

Nope. The whole point of developing the Raptor Engine was (A) to be able to reuse it and (B) to refuel on mars (using the Sabatier reaction with atmospheric CO2) for a return mission.