Atheysm or Atheism: How To spell?

The word Atheysm 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 'EY'
Wrong Spelling:  ath-ey-sm 
Correct Spelling:  ath-ei-sm 
Explore spell check of Atheism to spell without errors.