I suspect that the complete biblical idea of forgiveness involves repentance on the part of the one being forgiven.
Mark 1:4 (NIV)
4 And so John the Baptist appeared in the wilderness, preaching a baptism of repentance for the forgiveness of sins.
Actually, the following seems to make it very clear.
Luke 17:3-4 (NIV)
3 So watch yourselves.
“If your brother or sister sins against you, rebuke them; and if they repent, forgive them. 4 Even if they sin against you seven times in a day and seven times come back to you saying ‘I repent,’ you must forgive them.”
Acts 3:19-20 (NIV)
19 Repent, then, and turn to God, so that your sins may be wiped out, that times of refreshing may come from the Lord, 20 and that he may send the Messiah, who has been appointed for you—even Jesus.
1 John 1:9 (NIV)
9 If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.
(Many other relevant verses exist.)
So perhaps Christianity does not condone the seemingly fashionable type of empty “forgiveness” that does not depend on the repentance of the one being forgiven.
This means that it is actually correct not to forgive an unrepentant person.
Hence, “believers” who imagine that God has forgiven their sins, and that they can “rely” on Jesus to go to “heaven”, etc., I’m sorry to report that genuine repentance cannot be feigned.
Matthew 7:21-23 (NIV) True and False Disciples
21 “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven. 22 Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name and in your name drive out demons and in your name perform many miracles?’ 23 Then I will tell them plainly, ‘I never knew you. Away from me, you evildoers!’