Anathema is the Church’s use of the Keys to the Kingdom that Jesus left with the Apostles (Apostolic Successors). It really does not matter what religion a person is. If Jesus holds a person bound to sin in heaven, due to His sworn oath to Apostolic Successors or other wise, the person, Catholic or non-Catholic cannot go to heaven.
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In passing this sentence, the pontiff is vested in amice, stole, and a violet cope, wearing his mitre, and assisted by twelve priests clad in their surplices and holding lighted candles. He takes his seat in front of the altar or in some other suitable place, amid pronounces the formula of anathema which ends with these words: “Wherefore in the name of God the All-powerful, Father, Son, and Holy Ghost, of the Blessed Peter, Prince of the Apostles, and of all the saints, in virtue of the power which has been given us of binding and loosing in Heaven and on earth, we deprive N-- himself and all his accomplices and all his abettors of the Communion of the Body and Blood of Our Lord, we separate him from the society of all Christians, we exclude him from the bosom of our Holy Mother the Church in Heaven and on earth, we declare him excommunicated and anathematized and we judge him condemned to eternal fire with Satan and his angels and all the reprobate, so long as he will not burst the fetters of the demon, do penance and satisfy the Church; we deliver him to Satan to mortify his body, that his soul may be saved on the day of judgment.”
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 16:13 **
Jesus replied, “Blest are you, Simon son of John! No mere man has revealed this to you, but my heavenly Father. I for my part declare to you, you are ‘Rock,’ and on this rock I will build my church, and the jaws of death shall not prevail against it. I will entrust to you the keys of the kingdom of heaven. Whatever you declare bound on earth shall be bound in heaven; whatever you declare loosed on earth shall be loosed in heaven.”
NAB REV 1:16
A sharp, two-edged sword came out of his mouth, and his face shone like the sun at its brightest. When I caught sight of him I fell down at his feet as though dead, he touched me with his right hand and said: “There is nothing to fear. I am the First and the Last and the One who lives. Once I was dead but now I live-- forever and ever. I hold the keys of death and the nether world.”
NAB ISA 11:4
The Rule of Immanuel [indent]He shall strike the ruthless with the rod of his mouth, and with the breath of his lips he shall slay the wicked. [/indent]**NAB JOH 20:20 **
At the sight of the Lord the disciples rejoiced. “Peace be with you,” he said again. “As the Father has sent me, so I send you.” Then he breathed on them and said: “Recieve the Holy Spirit. If you forgive men’s sins, they are forgiven them; if you hold them bound, they are held bound.” NAB MAT 5:22
What I say to you is: everyone who grows angry with his brother shall be liable to judgement; any man who uses abusive language toward his brother shall be** answerable to the Sanhedrin,** and if he holds him in contempt he risks the fires of Gehenna. **NAB MAT 18:17 **
“If he ignores them, refer it to the church . If he ignores even the church, then treat him as you would a Gentile or a tax collector. I assure you, whatever you declare bound on earth shall be held bound in heaven, and whatever you declare loosed on earth shall be held loosed in heaven.”