Not in this case. My heart is hard as a stone. I can sin without the least bit remorse and I cannot stop sinning. I'm a condemned man and don't even feel bad about it. Everything I say and do here is intellectual but not from the heart. There is no truth left in me.
A. A person who has truly fallen away would have no concept whatsoever of 'sin'. Sin is something the Holy Spirit tells us about. You wouldn't think of your 'sin' as 'sin'. Sin is not on the radar of someone who has fallen away.
B. You're expecting remorse to be a feeling. Why? You talk about being cold as as stone. Why? What have your emotions got to do with this?
Falling away is harder than you think. There are atheists who were once a Christian and they have dedicated their lives to destroying the faith. That's falling away. That's not you. The pharisees sinned against the Holy Spirit because they knew the truth and fought against it. You're not fighting against it, are you? If so, where? Not around here.
Ever wondered if God can remove your sin? You're so worried about how you're performing that you've lost sight of the fact that God is able to remove sin, not because you deserve it, but because he is full of grace.
Do you know what 'apostasy' means in Hebrews 6:6? It doesn't mean that sin has taken over. It means you actively renounce the faith and choose to have nothing to do with it.
Once again, I contend that you are not apostate. You are just depressed. You have just given up... but you haven't renounced the faith or gone to war against it. Depression sucks, but depression is not always emotional... it's often a state of numbness; a state of just letting your body rule over you because what's the use? It, and the devil, has won so many times, you might as well let it have free reign.
But that's not apostasy. That's depression. And God will never break a bruised reed. Neither life nor death, neither angels or demons, principalities nor powers, can separate you from God. Do you think sin can? Why is sin so powerful that God cannot break through it? Is sin some sort of kryptonite for God? Is he powerless against it? Is he unable to approach a human being with it and do something about it? Can the saviour who defeated death somehow not have the power to deal with sin, and to be with a person who is suffering under its powerful enslaving effects?
Jesus Christ is not so weak! What is sin to him? He pronounces forgiveness and pours out power just by the mere breath of his words. Why would he not reach in and destroy it? He can and he will. Just believe, and persist in believing, and see how even sin; how even cold hearts; how even ambivalence towards sin; how even depression and giving up; is no match for the One who has all authority in heaven and earth.