Thysm or Theism: How To spell?

The word Thysm is misspelled against Theism, meaning "Belief in God."

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