Thaust or Theist: How To spell?

The word Thaust is misspelled against Theist, a noun meaning "One who believes in the existence of a God; especially, one who believes in a personal God; -- opposed to atheist."

Word contains consecutive vowels 'EI' in between alphabets th & st is misspelled as 'AU'
Wrong Spelling:  th-au-st 
Correct Spelling:  th-ei-st 
Check more misspelled words of Theist to spell it correct.