Athysm or Atheism: How To spell?

The word Athysm is misspelled against Atheism, meaning "The denial of the existence of God."

Word contains consecutive vowels 'EI' in between alphabets ath & sm is misspelled as 'Y'
Wrong Spelling:  ath-y-sm 
Correct Spelling:  ath-ei-sm 
Navigate all incorrect spellings of Atheism to spell it right.