I think that is proably confusing for Christians because Jesus Christ was referred all the time as "Rabbi"
(A Jewish Teacher)and of course he had no degree but was all knowing of TORAH Jewish Law....
Being that they are called "Priest" "Pastor" "Reverend" "Minister" "Bishop" "Deacon" "Father" and everything else under the sun except for "Rabbi" then what we have here is a case of someone claiming false credentials and deceiving people.
Mohammed encouraged deception, but I am not aware that Jesus ever did.