Sin is the trespass the Laws of God, is a desobediêcia to that God established. God loves the pecador but not accepted the sin the sin in leads them for the death, but Jesus in rescues them for the life, the Eterna Life.
The biggest sin, that one that God cannot pardon, is that one who for the exercise of the free will, the persons refuse to accept the Jesus Christ, as only Saving enough e of its lives.
Nor the Shepherd, or the Priest, or the Angels, and so on... can pardon sins, nor at any moment were outorgado this authority, God only can pardon! through the blood of Just, Jesus Christ, in the vicarious sacrifice in the cross of the Calvário.
Because God loved the world in such way that he gave its unigênito Son, so that all that one that in it believes does not perish, but has the life eterna (Jo 3.16).
But, how much to the shy ones, and the incrédulos, and the abomináveis, and the homicidas, and the fornicários, and the wizards, and idólatras and all the mentirosos, its part will be in the lake that arde with fire and sulphur; the one that it is the second death (Apoc 21.8).
They will be of it are the cães and the wizards, and the ones that if prostituem, and the homicidas, and idólatras, and any that the lie loves and commits (Apoc 22.15).