I was always told that once someone becomes a Catholic, they are always a Catholic, and there really isn’t any way of taking it back in neither God’s nor the Catholic church’s eyes. I just read this other post that I would have replied to but it is closed.
Someone asked the question of whether or not people who leave the Catholic church are screwed in terms of the afterlife. Most people answered that no one knows and the forum moderator seemed to agree and leave it at that and closed it.
From what I was told that once a Catholic, always a Catholic, I got the understanding that once you are taught and understand and agree with the Catholic beliefs, you are to be set to the same standards as a Catholic even if you leave. I was taught this by my parents, in school, during confermation, and likely from a priest as well.
As to those who have said that we don’t know and cannot know. How do we know about the destinctions between mortal sin and venial sin, and that if you die in a state of mortal sin, you’re not getting into heaven?