That God cannot lie, is no advantage to your argument, because it is no proof that priests can not, or that the Bible does not
Accustom a people to believe that priests, or any other class of men can forgive sins and you will have sins in abundance
There were only a few shepherds at the first Bethlehem. The ox and the donkey understood more of the first Christmas than the high priests in Jerusalem. And it is the same today
All we who believe on Christ are kings and priests in Christ.