The opposite side of good is bad, so the bad is the opposite of good. If Satan existed, so Santa must exist to justify each other, else Satan can't exist. If God exists, then Lucifer must exist to justify that God is omnipresence and the creator, of the men and angels; and the most powerful of His creation, Archangel Lucifer the Morning Star must fall to justify God is everlasting and the ruler.
If one owns 100 billions, he is on the shore; yet if for the same figure - 100 billions - he owes, he is in the deep sea. Thus a play of words A-A-N-S-T is playing on this little string. Of note is, the n does look like a holder while the e looked like flinging [away the money] :). Maybe this is the genius of the word formulation using also the graphical imagination to construct the word own and owe in the subconsciousness of the human group psyche, similarly the word Santa/ Satan constructed with the same letters.
To emphasize, Santa and Satan must exist so that the opposite of each other can exist, nothing can exist on its own. If we talk about long, that's it compared to short it's called long, so is hot/cold, far/near, love/hate/, evil/good... etc., John is John because there are Tom, Mary, Ann...; Earth because there are Mars, Jupiter...; anything existed because it's different from other "things that's not this thing" that this anything got the unique name.
To play the letters: A-A-N-S-T
- consonant: N-S-T
- Vowel: A-A
SA + TA + (NA) > the 1st two combinations of consonant and vowel is chosen for Satan. Thus the only left arrangement of letters following the constrain of SA_TA_N is, SA_N_TA we have Santa!