"…repentance and remission of sins should be preached in His name to all nations,…"

 

Luke 24:46-49(NKJV)

Then He said to them, “Thus it is written, and thus it was necessary for the Christ to suffer and to rise from the dead the third day, 

and that repentance and remission of sins should be preached in His name to all nations, beginning at Jerusalem. 

And you are witnesses of these things. 

Behold, I send the Promise of My Father upon you; but tarry in the city of Jerusalem until you are endued with power from on high.”

Jesus was very clear about this.  Repentance and remission go together.  So why do so many Christians, Red Letter Christians especially, believe that remission is automatic and the repentance is automatic?  Why do they think that those who don't repent are entitled to all of the benefits of being heirs with Christ, without them actually being heirs in Christ?