Because they don't believe we are born in sin (they don't believe in the Fall of man)...

Psa 51:5 Behold, I was shapen in iniquity, and in sin did my mother conceive me.

Psa 58:3 The wicked are estranged from the womb: they go astray as soon as they be born, speaking lies.

Eph 2:1 And you hath he quickened, who were dead in trespasses and sins:

Gal 5:19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
Gal 5:20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
Gal 5:21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.

Because they don't believe anyone can know that they have salvation...

1 John 5:13 These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.

Because they don't believe many people will be in heaven...

Psa 130:7 Let Israel hope in the LORD: for with the LORD there is mercy, and with him is plenteous redemption.

Mat 9:37 Then saith he unto his disciples, The harvest truly is plenteous, but the labourers are few;

Jude 1:3 Beloved, when I gave all diligence to write unto you of the common salvation,

Rev 7:9 After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;

Because they don't believe in the priesthood of the believer...

John 20:20 And when he had so said, he showed unto them his hands and his side. Then were the disciples glad, when they saw the Lord.
John 20:21 Then said Jesus to them again, Peace be unto you: as my Father hath sent me, even so send I you.

1 Pet 2:5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.

1 Pet 2:9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should show forth the praises of him who hath called you out of darkness into his marvellous light:

Because they don't believe people should worship God ANYWHERE but in a home...

Mat 18:20 For where two or three are gathered together in my name, there am I in the midst of them.

John 4:20 Our fathers worshipped in this mountain; and ye say, that in Jerusalem is the place where men ought to worship.
John 4:21 Jesus saith unto her, Woman, believe me, the hour cometh, when ye shall neither in this mountain, nor yet at Jerusalem, [but in a home]worship the Father.

Because they don't believe in talking to others (witnessing) about what Christ has done...

Psa 107:2 Let the redeemed of the LORD say so, whom he hath redeemed from the hand of the enemy;

Psa 145:11 They shall speak of the glory of thy kingdom, and talk of thy power;

2 Cor 4:13 We having the same spirit of faith, according as it is written, I believed, and therefore have I spoken; we also believe, and therefore speak;

Heb 13:15 By him therefore let us offer the sacrifice of praise to God continually, that is, the fruit of our lips giving thanks to his name.

Because they prefer to believe that the Bible always refers to "spiritually" poor and needy...

Psa 82:3 Defend the poor and fatherless: do justice to the afflicted and needy.
Psa 82:4 Deliver the poor and needy: rid them out of the hand of the wicked.

Isa 58:6 Is not this the fast that I have chosen? to loose the bands of wickedness, to undo the heavy burdens, and to let the oppressed go free, and that ye break every yoke?
Isa 58:7 Is it not to deal thy bread to the hungry, and that thou bring the poor that are cast out to thy house? when thou seest the naked, that thou cover him;

Ezek 16:49 Behold, this was the iniquity of thy sister Sodom, pride, fulness of bread, and abundance of idleness was in her and in her daughters, neither did she strengthen the hand of the poor and needy.

Because they believe musical instruments are just for "entertainment"...

Psa 144:9 I will sing a new song unto thee, O God: upon a psaltery and an instrument of ten strings will I sing praises unto thee.

Because they believe that other Christian ministers are from Satan...

Mat 7:1 Judge not, that ye be not judged.

Mark 9:40 For he that is not against us is on our part.

John 9:33 If this man were not of God, he could do nothing.

Rom 14:4 Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.

James 1:27 Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.

James 4:11 Speak not evil one of another, brethren. He that speaketh evil of his brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge.
James 4:12 There is one lawgiver, who is able to save and to destroy: who art thou that judgest another?

Phil 1:18 What then? notwithstanding, every way, whether in pretence[not sincerely], or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.

1 Cor 12:3 Wherefore I give you to understand, that no man speaking by the Spirit of God calleth Jesus accursed: and that no man can say that Jesus is the Lord, but by the Holy Ghost.
1 Cor 12:4 Now there are diversities of gifts, but the same Spirit.
1 Cor 12:5 And there are differences of administrations, but the same Lord.
1 Cor 12:6 And there are diversities of operations, but it is the same God which worketh all in all.

1 John 3:7 Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.

1 John 4:2 Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
1 John 4:3 And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.

Because they believe God only loves the righteous...

John 3:16 For God so loved [some in] the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

Rom 5:6 For when we were yet without strength, in due time Christ died for the ungodly.
Rom 5:7 For scarcely for a righteous man will one die: yet peradventure for a good man some would even dare to die.
Rom 5:8 But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us.

Because they believe they are Apostles in the same manner as the 12 and 70 were...

Acts 1:20 For it is written in the book of Psalms, Let his habitation be desolate, and let no man dwell therein: and his bishopric let another take.
Acts 1:21 Wherefore of these men which have companied with us all the time that the Lord Jesus went in and out among us,
Acts 1:22 Beginning from the baptism of John, unto that same day that he was taken up from us, must one be ordained to be a witness with us of his resurrection.

Because they believe salvation is not nearly so simple as the Bible says...

Rom 10:9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Rom 10:10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
Rom 10:11 For the scripture saith, Whosoever believeth on him shall not be ashamed.

Because they commonly exercise great power and authority over people...

2 Cor 1:24 Not for that we have dominion over your faith, but are helpers of your joy: for by faith ye stand.

Mat 6:9 After this manner therefore pray ye: Our [Master] Father which art in heaven, Hallowed be thy name.

John 15:15 Henceforth I call you not servants; for the servant knoweth not what his lord doeth: but I have called you friends; for all things that I have heard of my Father I have made known unto you.

2 Cor 4:5 For we preach not ourselves, but Christ Jesus the Lord;

Because they commonly preach that only people within their form of religion are in "truth"...

1 John 3:18 My little children, let us not love in word, neither in tongue; but in deed and in truth.
1 John 3:19 And hereby we know that we are of the truth, and shall assure our hearts before him.

1 John 3:7 Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.

Because they hardly ever witness it...

Psa 118:15 The voice of rejoicing and salvation is in the tabernacles of the righteous:

Because they don't do it or teach it...

Titus 2:10 Not purloining, but showing all good fidelity; that they may adorn [from the same Greek root as Cosmetics] the doctrine of God our Saviour in all things.

Anything that would give reference to later ministers being called Apostles (Timothy and Titus were never called Apostles). Ref: Acts 1:20-22 Or verses stating a requirement for an intermediary between God and man (besides Jesus).