If Saint Peter is there, the power of redemption must exist. Quick catechism lesson, during the last supper, Jesus said "One of you will betray me", and everyone asked "Is it me?" "It's me?" It's me?". We all know that it was Judas the bastard, but Saint Peter was the only one "apart from Judas" to have an answer, in fact Jesus told him "You will deny me three times before the rooster crows." Subsequently Peter denied knowing him several times, to people who said "Wait, weren't you part of that guy's group in court?", and Peter denied it three times, then the rooster crowed. In fact he denied knowing Jesus to avoid being slaughtered alive, but despite this, when he dies upside down (Fun Fact: Saint Peter was crucified upside down because he asked for it himself, because he didn't feel worthy of dying in the same way of Jesus) will still end up in Heaven with already a job, Keeper of the keys and places of Paradise. If redemption isn't possible, then why the fuck is it there.