6

The day that God created Man
The atomic number of carbon

7

The neutral pH value between acidity and akalinity
The atomic number of nitrogen
Number of periods on the periodic table
All mammal's necks have 7 bones (mostly)
The number of days of Creation

7 is a great number
6...not so...

I want a 7!

Ultimately, if it is God's will, a 6 will do fine and I will try harder this year...