Orthodox Apologetics

Matthew 5:43 ¶Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy. 44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; 45 That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust. 46 For if ye love them which love you, what reward have ye? do not even the publicans the same? 47 And if ye salute your brethren only, what do ye more than others? do not even the publicans so? 48 Be ye therefore perfect, even as your Father which is in heaven is perfect.

Because God is a Trinity, not a Monad.

1. Man and woman are one:

Genesis 2:24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.

2. Father and Son are one:

John 10:30 I and my Father are one.

3. Mankind is in God's image, the family being the icon of the Trinity:

Genesis 1:27 So God created man in his own image, in the image of God created he him: male and female created he them.

4. Hence why, in conclusion (since children are one flesh with their parents, and wives one flesh with their husbands) the members of a family or household are received communally, and not individually, into the Church:

(See: Acts 16:15; Acts 16:31-34; Acts 18:8; 1 Corinthians 1:16; Hebrews 11:7; 1 Peter 3:20).

When parents entered into covenant with God, they brought their children with them. This was a law in the Hebrew Church. When a proselyte was received into membership, he could not enter without bringing his children with him. -- Easton's Bible Dictionary.

Because the former makes repentance impossible, since nobody repents for things that are not sins.

(I do not repent of the fact that I have dark hair, for instance).

Isaiah 5:20 Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter!

Luke 18:13 And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner.

...or a short history of Western Christian thought, from Shakespeare to Orwell:

Unlike their sinful Protestant and Orthodox counterparts, Catholics don't get a divorce... they get an annulment.

Unlike their unregenerate and totally-depraved Catholic and Orthodox counterparts, Protestants don't sin... they "backslide ".

Psalm 141:4 Incline not my heart to evil words; to make excuses in sins.