The family of the Cohanim exist to this day but since the Temple no longer exists, their service consists of special synagogue rituals, including the Birkat Kohanim and Pidyon Haben (redemption of the first-born son).
Any Jew, whether he is a Cohen, Israelite or convert, may be ordained as a Rabbi provided that he has passed the qualifying examination for semicha.
I think Mr. or Ms. "Lewite" has invented his/her own religion which has little to do with ancient or traditional Judaism.
Oh but Alouette, when Ezra and Nehemiah came to Jerusalem from Babylon to rebuild that temple they had no one of the tribe of Levi with them. They had to send back for a member of the tribe of Levi.
The 'priest' became lazy and allowed servants to do what was required of them to do. It is written.
Thanks for the info. I obviously have more reading to do!