Some time ago a Protestant friend told me he would go to heaven because he had accepted Jesus, who redeemed him and died for him and will save him. His spouse married him for better or for worse and will stick by him, so will God.
2 Peter 2: 20-21
But a Catholic will be condemned to hell for all eternity for disobeying God or his Church, in a grievous way, with clear knowledge and full consent…The Catholic is the ‘slave of Christ’, and is not free to make up her/his own mind about what to do or avoid. The Protestant can decide what is moral and what is not.
1 John 3:3-6, 14
The answer for me is that we cannot know the mind of God and must trust in his mercy. We judge God from our point of view, but he judges us in his way. In the end his mercy may prevail, and all may be saved.
As Scripture tells us, ‘mercy triumphs over judgement’ [James 2:13], and ‘love covers a multitude of sins.’ [1 Peter 4:8]
Many of the posts disagreed with the belief of (some) Protestants in the great love, mercy and faithfulness of God.
It isn’t that we disagree with God’s great love, mercy and faithfulness… it’s simply that Scripture is not about taking verses in isolation. We acknowledge that we are saved by our faith, but faith is not simply acknowledging a belief in Christ… it’s much more. To love God is to keep His commandments, and it is to love one’s neighbour.
However, the issue about very many Catholics going to hell was not addressed. Will a huge number of Catholics go to hell for sexual sins against Catholic teaching and the rejection of Church authority and rules?
See Matthew 7:13-14 and Matthew 7:21-23. We don’t determine who does and doesn’t go to heaven. God is the just judge. We hope in our salvation, but we must remain with Our Lord [John 15:6] and [John 10: 27-29]
Please bear in mind the conditions of mortal sin, but going back to your first post:
Missing Mass on Sunday without good reason. - This is the new testament fulfilment of the commandment keeping the Sabbath holy. We know that keeping the Lord’s day holy is from the earliest days of Christianity as we can still read what the Saint and Martyr, Bishop Ignatius of Antioch wrote about it. He lived in the first century AD.
Bad thoughts - … it really depends on what those bad thoughts are, for example 1 John 3:15
Masturbation - 1 John 2:15-16 says that lusts/desires of the flesh are not from God
Sex outside of marriage… Mark 10:7-8, Exodus 22:16 says that we should be married to this person
Non-catholic marriage - … a Catholic shouldn’t have a non-Catholic marriage without a dispensation, but a marriage between two non-Catholics would be valid.
Divorce - Mark 10:4-9
Contraception - Psalm 127:3-5
[Edited to correct a chapter number]