Hello Alma,
Well we know Korah is in hell for attempting to schism from God’s authorized leaders of the Israelite Church. Scripture tells us Korah is in hell. We also know that Satan is in hell because Jesus tells us this. Pope Benedict XIV believes that Judas Iscariot is in hell. So there are at least three which defeats your priests theory that hell is empty.
AnathamaBenedict XIV (1740-58–De Synodo dioecesana X, i) cites the anathema maranatha formulated by the Fathers of the Fourth Council of Toledo against those who were guilty of the crime of high treason: "He who dares to despise our decision, let him be stricken with anathema maranatha, i.e.
may he be damned at the coming of the Lord, may he have his place with Judas Iscariot, he and his companions.
Quoted from New Advent Catholic Encyclopedia
newadvent.org/cathen/01455e.htm
NAB MAT 25:41
Then he will say to those on his left,
'Depart from me, you accursed, into the eternal fire prepared for the devil and his angels.
NAB NUM 16:16 Korah. Moses said to Korah, “You and all your band shall appear before the LORD tomorrow–you and they and Aaron too. Then each of your two hundred and fifty followers shall take his own censer, put incense in it, and offer it to the LORD; and you and Aaron, each with his own censer, shall do the same.” So then all took their censers, and laying incense on the fire they had put in them, they took their stand by the entrance of the meeting tent,
the glory of the LORD appeared to the entire community, and the LORD said to Moses and Aaron, “Stand apart from this band, that I may consume them at once.” But they fell prostrate and cried out, “O God, God of the spirits of all mankind, will one man’s sin make you angry with the whole community?” The LORD answered Moses, “Speak to the community and tell them: Withdraw from the space around the Dwelling” [of Korah, Dathan and Abiram].
**Punishment of Dathan and Abiram. **Moses, followed by the elders of Israel, arose and went to Dathan and Abrim. Then he warned the community, “Keep away from the tents of these wicked men and do not touch anything that is theirs: otherwise you too will be swept away because of all their sins.” When Dathan and Abiram had come out and were standing at the entrance of their tents with their wives and sons and little ones, Moses said, "This is how you shall know that it was the LORD who sent me to do all that I have done, and that it was not I who planned it: if these men die an ordinary death, merely suffering the fate common to all mankind, then it was not the LORD who sent me. But if the LORD does something entirely new, and
the ground opens its mouth and swallows them alive down into the nether world, with all belonging to them, then you will know that these men have defied the LORD." No sooner had he finished saying all this than the ground beneath them split open, and the earth opened its mouth and swallowed them and their families [and all of Korah’s men] and all their possessions. They went down alive to the nether world with all belonging to them; the earth closed over them, and they perished from the community. But all the Israelites near them fled at their shrieks, saying, “The earth might swallow us too!”
**NAB JUD 1:10 **
These people, however, not only revile what they have no knowledge of but are corrupted through the very things they know by instinct, like brute animals. So much the worse for them! They have taken the road Cain took. They have abandoned themselves to Balaam’s error for pay, and like Korah they perish in rebellion. These men are blotches on your Christian banquets. They are wild ocean waves, splashing their shameless deeds abroad like foam, or shooting stars for whom the thick gloom of darkness has been reserved forever.
Believe it or not this priest is guilty of idolatry. He is making a God to fit his belief system. Hell is for those who reject Gods mercy.Once Gods judgement has been set its to late to repent. It breaks Gods heart and He continues to love even those in Hell. Every person has been given a free will. Its our choice. Heaven or Hell. Scripture is full of verses that describes what Hell is like. Its full of torment, pain,suffering screaming, foul smelling, full of worms,darkness,glooming,ect. Not a place one wants to be for eternity… 
