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I once heard of a dyslexic satanist who sold his soul to Santa.

Pure coincidence. There may be nothing weird or sinister about it. In any case, there are best 26 letters within the alphabet, and something like ¾ million phrases within the English language (mostly extra by way of now), so there are certain to be hundreds of thousands, maybe hundreds and hundreds of hundreds of thousands of quirky anagrams amongst them. In fact, the two phrases originate from absolutely distinct languages, so there's no query of any viable connection between them. Devil comes from old Hebrew through Greek and Latin, whilst Santa approach saint in a few European languages. Probably you should begin a cult, arguing, as some responders have already instructed, that Santa is a fiendish Satanic plot to subvert and corrupt all the children. I'm certain that you'd get thousands of followers very quickly !

The english word for Santa is Saint.

The Arabic for Satan is Shaitan.

The anagram is pure coincidence

Atheist is an anagram of Hate.Sit So what?

Depends on the language. Santa in Spanish means holy.

Santa = Saint

The world is weird let alone our languages

Good = God if you drop the O

Evil = Devil if add the D

God = Dog backwards so who's really your best friend?

Hmmm I don't find it weird. Lots of words are anagrams of others.

Australian is an anagram of Saturnalia. That is a far more fun-filled link!

Interesting I guess but it's a translation of saint after saint Nicolas

Some weird@s$ guy that watches me all year and then breaks into my house through the chimney and moves stuff around and expects me to feed him for it.