Webster's New World College Dictionary says of pariah that it is pronounced "/pə'raɪə/; Brit also /pɑ'riə/." That is, the varant with /i/ is found in British but not American English, while the variant with /aɪ/ is found in both of these branches of the language. As noted earlier in this thread /ɪ/ is the sound in hit and bit while /i/ is the sound in heat and beet.
Note, however, that in some dictionaries using a version of IPA, /i/ is used for the vowel in hit and bit while /iː/ is used for the vowel in heat and beet. So be sure to identify which system your dictionary is using to see what pronunciation it is suggesting for pariah.