"The heart [is] deceitful above all [things], And desperately wicked; Who can know it?"
-- Jeremiah 17:9
Quite apart from that, is the mind under our complete control when we are dead? The fact that we cannot control the fact that we cannot avoid death suggests otherwise. The ancients would say that our mind could not possibly be under our complete control, dead or alive, since it, like the rest of our selves, depends utterly on God for its existence. Human being is contingent being, and therefore is not autonomous.
William Lane Craig is much too sanguine about Descartes, here.