this is not about judging...according to your doctrine if at any point of his life he was saved... that sin is already forgiven....now you are saying he must account for his actions and answer to God for what he has done.......his sins are already forgiven what actions are you talking about...the Guy had the confidence to write a letter showing his belief...why would you think he is pretending....
The heart of man is deceitful above all things and desperately wicked who can know it? Jer 17:9
This is the paradox that you get into when you attempt to play God and judge the salvation of another.
For the cause of Christ
Roger