But those categories of mortal sin are created by the Roman Catholic Church and no other group of people, religious or not.
How can non-Catholics be bound to that list? Even if the subject matter is agreed upon (for instance, honoring one’s father and mother), other faiths/cultures have different standards on how to enact this behavior and the penalties for not enacting this behavior.
The Catholic Church does not create morality. Morality is the evaluation of human acts in the light of God’s love, wisdom, providence.
Morality points us to the only true good, which is right relationship with God himself. The Catholic Church does not create the good, obviously. The Catholic Church expresses the good, and expresses it to the fullest extent as revealed by God through Jesus Christ.
While you may not share the Church’s expression of morality, perhaps you can at least agree that morality expresses something,
anything, that is objectively true, outside your own prerogatives.
If you can agree that God is the source and provider of all that is good, you might be led to wonder where the expression of that good is to be found. Christ is to be expressed and found somewhere, right? Or is Christ subject to the individual? That would seem to be problematic for a believing Christian.
Being on a Catholic apologetics blog and searching for true answers to these questions seems to be a good thing. As a person comes to fuller knowledge of Christ, we come closer to that “good”, and we also come to a fuller realization of how much distance there is, objectively, between what God asks of us and how we behave morally. We are all separated from Christ by sin, and he draws us back to him.
Not agreeing with a particular moral precept does not absolve a person who rejects it. Rejection is rejection. Knowing about it and rejecting it,
is rejection of it, not an excuse from culpability under the authority of one’s own rejection.
It is no different that claiming that you have no responsibility to feed the hungry because “you do not believe” with the Catholic Church. You would be objectively wrong whether you excused it with your own beliefs or not.
Sin is rejection of the goodness that God offers us, a severing of the relationship in preference to ourselves. It is not a set of arbitrary restrictions.