In other words, it is quite possible that a reprobate can be deceived by his own heart into believing that he has truly repented, when in fact his sincere belief in Christ (as he believes it) and his sincere belief in his repentance (as he understands it) is a false repentance and a false belief and that it was God's intention all along that he believe wrongly and that he repent wrongly in order that he might be cast into hell as vessel of wrath fitted for destruction.
And you wonder why non-Calvinists recoil at the claims of Calvinists about the nature of God.
“And you wonder why non-Calvinists recoil at the claims of Calvinists about the nature of God. “
No, I wonder at the false caricatures of the Non-Reformed. Of course you want to frame the question in such a way that makes it look abhorent and, incidentally, try to conform God to your image of how he should run his creation.
The pertinent question is what do you mean by “sincere belief in Christ”? Christ told us that there will be many that call on his name that were never his servants. So we must mine the biblical data to understand how those who call on his name can at the same time not be regarded as his servants.
The biblical data is clear that those who try to add anything to the work of Christ truly do not have a sincere belief in Christ. If one truly trusted Christ and his work why would anything more need be added? He did it all. Full stop. Full belief.