[Aquila]

Originally Posted by shag

How exactly do house churches keep from disputes over doctorines? .....Do the elders in charge draw the line on what is or isnt open for dispute?

Different house churches do it differently. Some have not issue with attendees having different doctrinal ideas because of their different religious backgrounds. Others establish an "articles of faith" early on and these serve as the non-negotiables. I've considered using the Christian Development Courses 1 & 2 by Pastor Crawford Coon to root elders in Apostolic doctrine. A general statement of beliefs could be as follows to set specific doctrinal tenants:

What we believe...

We believe that the Bible in its original languages is uniquely the infallible, unchangeable, divinely inspired Word of God by which all believers are to order their lives. (2 Timothy 3:16; Proverbs 30:5-6; Psalm 119:89; Matthew 7:24-27)

We believe that there is one God, who is Creator of all things and Lord over all creation; that He is an eternal, invisible, omnipresent, almighty Spirit; that He is holy; that He is merciful and good; and that He is the author and arbiter of all Truth; and that God is ONE. (Isaiah 45:5; 1 Corinthians 8:6; Revelation 4:11; Matthew 11:25; Psalm 90:2; 1 Timothy 1:17; Jeremiah 23:24; Genesis 17:1; John 4:24; 1 Peter 1:16; Psalm 103:8; Psalm 145:9; Deuteronomy 32:4; 6:4)

We believe that God was manifest in flesh as the Man, Jesus of Nazareth, who is the Son of God, the Christ, and our Savior; that in Him dwells all the fulness of the Godhead bodily; and that the name JESUS is the only personal name of Deity given among men whereby we must be saved. (1 Timothy 3:16; Romans 1:3; Matthew 16:16; John 4:42; Colossians 2:9; John 5:43; Hebrews 1:4; Philippians 2:9; Acts 4:12)

We believe that Jesus Christ, the Son of God, was fully human; that He was begotten of the Spirit, born of the virgin Mary, lived a sinless life, was crucified for our sins, rose bodily from the dead on the third day, ascended into heaven, poured out the Holy Spirit, gave ministerial gifts to the Church, and is coming again to reward all human beings according to their works. (1 Timothy 2:5; Hebrews 2:16; Matthew 1:18; Luke 1:35; Hebrews 4:15; 1 Corinthians 15:3; Luke 24:51; Acts 1:9-11; 2:1-4; Ephesians 4:7-11; Revelation 22:12).

We believe that salvation was purchased for all by the blood of Jesus Christ, but is effective only in those who repent, believe, and obey. (2 Corinthians 5:14; Luke 13:3; Mark 1:15; Acts 16:31; Hebrews 5:9)

We believe that salvation is based solely and entirely upon the death, burial, and resurrection of Jesus Christ, but that salvation is received through repentance from sin and faith in Jesus Christ, which must be expressed by baptism in water in the name of Jesus Christ for the remission (or forgiveness) of sins; and that those so doing are promised the gift of the Holy Spirit, which is initially evidenced by speaking in other tongues as the Spirit gives utterance. (Acts 2:38; Acts 10:44-48; Acts 19:1-6; Acts 2:1-4)

We believe that all believers must follow on to know the Lord, to keep His commandments, to perfect holiness, to love their neighbors as themselves, and to live in a manner that reflects a total commitment to the principles and standards of Christianity as set forth in the Bible—and that anything less than this will ultimately result in a departure from the faith, a falling away, and a fearful expectation of judgment. There is no unconditional eternal security. (Hosea 6:3; 1 John 2:3; 2 Corinthians 7:1; Matthew 22:39; Titus 3:12; 1 Timothy 4:1; Hebrews 6:4-6; Hebrews 10:26-27)

We believe that there will be a bodily resurrection of the just and the unjust; that all must appear before the judgment seat of Christ; that all who have been faithful will live forever with Jesus Christ; and that all who are unbelieving and unfaithful will be destroyed in the lake of fire, which God has prepared for the devil and his angels. (Daniel 12:2; Acts 24:15; Romans 14:10; 1 Thessalonians 4:13-18; Revelation 20:12-15; Matthew 25:41)

Some house churches simply hold to the Apostle's Creed....

The Apostle's Creed

I believe in God, the Father almighty, creator of heaven and earth;
I believe in Jesus Christ, his only Son, our Lord. He was conceived by the power of the Holy Spirit and born of the Virgin Mary. He suffered under Pontius Pilate, was crucified, died, and was buried. He descended to the dead. On the third day he rose again. He ascended into heaven, and is seated at the right hand of Father. He will come again to judge the living and the dead.
I believe in the Holy Spirit, the holy catholic Church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting. Amen.

(translation by the International Consultation on English Texts)

*Please note: The Creed, although having a Trinitarian structure, is not explicitly Trinitarian. The Creed began to be developed before the Trinitarian controversy arose, and the Creed (unlike the Nicene Creed) was not an attempt to correct a specific heresy.