Webster's New Collegiate Dictionary:
"euphemism ... the substitution of an agreeable or inoffensive expression for one that may offend or suggest something unpleasant; also : the expression so substituted."
Ephesians 4:29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers. 30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
The following list was compiled using Webster's New Collegiate Dictionary, Webster's New World College Dictionary, Roget's International Thesaurus, Rodale's Synonym Finder, and other references.
Euphemisms for God:
ga
gad
gadfrey
gawd
godfrey
gol
golly
good God
good gracious
good grief
good Lord
goodness
goodness gracious
goodness me
good night
gosh
gracious
great Scott
od
odd..."
Psalm 25:7 Do not remember the sins of my youth, nor my transgressions;According to Your mercy remember me, For Your goodness’ sake, O LORD.