In seriousness, isn't there disagreement among Protestants about this? I am certainly drawn to Kierkegaard and that line, but I always remember Bunyans line which is more or less "Then I saw that there was a way to hell even from the gates of heaven."
I'm not fighting here, just wondering: what do you make of Peter denying Christ in terms of this question?
We need to get rid of the Catholic vs Protestant argument and put the focus where it needs to be, on the Lord Jesus Christ. If the clear Gospel was taught, we wouldn't be having this discussion at all. If you are depending on a church, a priest, a baptism or anything else as a way to eternal life then you are mistaken. Jesus Christ paid the penalty we could not pay. He did all that was necessary. His death,burial and resurrection paid for ALL our sins. We are free from an eternal hell. It's the good news. Anything else, we can agree to disagree. We are under grace and some things can be argued but it is clear when it comes to salvation in the bible. We have disagreements because we won't actually read the bible for ourselves. We depend on a preacher or a priest to tell us what's in it. If you don't study God's written word and know it, how can you discern the truth from falsehoods? You are either depending on Jesus for salvation or a religion and I know who I am trusting with my eternal soul.