It is not possible to remove that rock. It is huge and is on a very steep mountain side over the sea with no access to it. It could be possible with very advanced machines I guess at a ridiculous cost.

The monks there are convinced that one can cheat death and that's what they are trying to do there. They think that God himself became mortal to make that possible and show them how. One still has to die to do that according to them though. Among other things this ensures that you are not afraid of death anymore and you are not running away from it but face it and still win. Their way of cheating is not that you don't die but that you die but not stay dead.