Originally, a “hack” was an alteration of a program or an intrusion into an otherwise closed system. But the word downgraded to mean any trick to get something done easier than the standard process.
To get into Heaven is no small thing. There are those that trust in their wealth, and boast themselves in the multitude of their riches. But none of them can by any means redeem his brother, nor give to God a ransom for him. For the redemption of their soul is precious. — Psm 49:6-8.
A lot of people fail to appreciate just how great a thing Christ did. He achieved for us what none of us could achieve for ourselves: the forgiveness of sins. He is our hack into the otherwise impenetrable system of Heaven.