Its funny how many atheists try to cite their own strange interpretation Matthew 5:18, but then fail to read the rest of Matthew 5, which explicitly talks about the weaknesses of the old law. Read the rest of Matthew 5, and then give me your interpretation of Matthew 5:18. 
And yes, even within the OT, OT law is applicable to Jews. This is why not a single branch of Christianity follows or ever has followed OT law.
And yes, even within the OT, OT law is applicable to Jews. This is why not a single branch of Christianity follows or ever has followed OT law.
Mary Immaculate, star of the morning
Chosen before the creation began
Chosen to bring for your bridal adorning
Woe to the serpent and rescue to man.
Sinners, we honor your sinless perfection;
Fallen and weak, for your pity we plead;
Grand us the shield of your sovereign protection,
Measure your aid by the depth of our need.
Bend from your throne at the voice of our crying,
Bend to this earth which your footsteps have trod;
Stretch out your arms to us, living and dying,
Mary Immaculate, Mother of God.
Chosen before the creation began
Chosen to bring for your bridal adorning
Woe to the serpent and rescue to man.
Sinners, we honor your sinless perfection;
Fallen and weak, for your pity we plead;
Grand us the shield of your sovereign protection,
Measure your aid by the depth of our need.
Bend from your throne at the voice of our crying,
Bend to this earth which your footsteps have trod;
Stretch out your arms to us, living and dying,
Mary Immaculate, Mother of God.
