| Number of Members | 350,000[1] | 1,360,000,000[2] |
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| How does one get saved? | Sola fide: Repent of your sins and believe in Jesus Christ's death and resurrection alone to save you. | Repent of your sins, believe in Jesus Christ's death and resurrection to save you, be baptized, participate in the Eucharist, and don't die with any unconfessed mortal sins.[3][4] |
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| Who gets saved? | Anyone who chooses by his own free will to believe and accept God's gift of grace will be saved. | Anyone who chooses by his own free will to believe and accept God's gift of grace will be saved. |
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| Can one lose his salvation? | Eternal security: No, once a Christian is saved, he is always saved. | Yes, a Christian can lose his salvation by apostasy or by committing a mortal sin. |
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| Who gets baptized and why? | Saved people get baptized as a public demonstration of their new lives. | The unsaved, typically as infants, get baptized as the first sacrament of Christian initiation, cleansing them of all sins. |
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| How should baptism be done? | Baptism should be by immersion. | Baptism should be by pouring water on the head. |
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| When does one receive the Holy Spirit? | The Holy Spirit is received at the moment of salvation. | The Holy Spirit is received at baptism. |
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| What is the trinity? | Most believe the Trinity is God existing as one god in three equal, eternal, cosubstantial persons: God the Father, God the Son (Jesus Christ), and God the Holy Spirit. | The Trinity is God existing as one god in three equal, eternal, cosubstantial persons: God the Father, God the Son (Jesus Christ), and God the Holy Spirit. |
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| What is the human nature? | Humans have a יֵצֶר הַרַע (yetzer hara)—an inclination to do evil—and, upon reaching 12 for girls and 13 for boys, develop a יֵצֶר הַטוֹב (yetzer hatov)—a weaker inclination to do good. | Human nature is not totally corrupt but is wounded and inclined to evil.[5] |
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| Are we guilty of Adam's original sin? | No, we are not guilty of Adam's sin, but we did inherit the consequences and a corrupt human nature from him, causing us all to sin. | No, we are not guilty of Adam's sin, but we did inherit the consequences and a corrupt human nature from him, causing us all to sin.[6] |
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| Are Christians required to keep the Old Testament ceremonial laws? | Yes, Messianic Jews should follow the Torah, although Gentile Christians are not required to. | No, the ceremonial laws of Judaism were fulfilled and done away with by Jesus. |
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| Can Christians become sinless in this earthly life? | No, although Christians can and should sin less, they can never become sinless in this life. | "Christian perfection" is attainable in this life, but this does not mean one is sinless, as one will always commit minor "venial sins". |
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| Do the elements of communion become the body and blood of Christ? | No, the elements merely symbolically represent the body and blood of Christ. | Transubstantiation: Yes, the bread and the wine change into the body and blood of Christ. |
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| Can one be baptized of behalf of someone who has died? | No, the dead cannot be baptized. | No, the dead cannot be baptized. |
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| What happens if a saved person dies without being perfect? | Once Christians leave their sinful bodies, nothing else is needed to receive glorified, sinless bodies. | Christians who die imperfectly purified must be purified through purgatory.[7] |
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| Did Mary ever sin? | Yes, Mary sinned like all other humans except Jesus. | Immaculate conception: No, Mary was free of original sin and remained sinless throughout her life. |
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| What spiritual gifts are available today? | | Most believe that all spiritual gifts are still available to believers. |
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| What are the requirements for clergy? | | Priests must be unmarried men over 25 ordained by bishops. |
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| How many church ordinances/sacraments are there? | Messianic Jews should practice Immersion.[8][9][10][11][12] | The church has seven sacraments: Baptism, Confirmation, the Eucharist, Penance, the Anointing of the Sick, Holy Orders, and Matrimony.[13] |
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| To whom do Christians need to confess their sins? | Confession should be made directly to God, but confession to another believer is beneficial for some sins.[14][15] | Mortal sins must be privately confessed to a priest at least annually.[16][17] |
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| How should a church be structured? | Congregationalist: Every church congregation should be independent and governed by its members. | Episcopal: Churches should be governed by the bishop in that diocese, who in turn is governed by an archbishop, who is governed by the Pope. |
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| What day of the week should Christians worship? | Messianic Jews observe Shabbat on Saturday. | Christians worship on Sunday. |
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| How does God's revelation come to us today? | Prima scriptura: There are many sources of God's revelation, although none can contradict the Bible.[18] | Sacred Scripture and Sacred Tradition have equal authority and comprise one finished deposit of faith. |
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| How many books are in the Bible? | There are 66 canonical books of the Bible: 39 Old Testament books and 27 New Testament books. | There are 73 canonical books of the Bible: 39 protocanonical books, 7 deuterocanonical books, and 27 New Testament books. |
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| Was the Bible written inerrantly? | | No, the Bible was written inerrantly on matters of salvation but may contain errors in other matters. |
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| Who can speak with God's authority today? | | The Pope speaks infallibly with God's authority when speaking ex cathedra.[19][20] |
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| How was the earth created? | | The earth was formed by gravity pulling dust together, which ultimately came from the Big Bang. |
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| What is marriage? | Marriage is a covenant before God between one man and one woman.[21] | Marriage is a covenant before God between one man and one woman.[22] |
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| Is sex permissible outside marriage? | No, sex outside of marriage is not permissible.[23] | No, sex outside of marriage is not permissible. |
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| When is divorce permissible? | Divorce is permissible for adultery, abuse, or abandonment.[24] | Divorce is never permissible. |
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| May a Christian remarry while his former spouse is still alive? | Yes, a Messianic Jew may freely remarry after a divorce which was for a valid reason.[24] | Divorce is never permissible. |
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| When does a fetus become human? | Humanity begins at conception.[25][26] | Humanity begins at conception.[27] |
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| Is contraception permissible? | Yes, contraceptives are permissible as long as the couple eventually have at least two children.[28] | No, contraceptives are not permissible.[29] |
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| Are blood transfusions permissible? | Yes, blood transfusions are permissible.[30][31] | Yes, blood transfusions are permissible. |
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| Should women cover their heads? | Varies widely[32][33][34] | No, head coverings are no longer required due to cultural changes.[35] |
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| Should Christians drink alcohol? | Yes, drinking alcohol is fine as long as one does not get drunk.[36] | Yes, drinking alcohol is fine as long as one does not get drunk.[37] |
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| Should Christians fight in wars? | | Yes, Christians should fight in just wars.[38][39] |
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| Whom does the Holy Spirit come from? | | The Holy Spirit proceeds from the Father and the Son.[40] |
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| Who can be demon-possessed? | | Demons can possess anyone.[41] |
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| Do icons glorify God? | | Yes, icons are holy and should be venerated. |
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| Where does a Christian's soul go after death? | | Some Christians first go to purgatory to be purified when they die.[7] |
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