Yet Jesus's words contradict you: He who believes and is baptized will be saved.
If A then B does not imply If not A then not B(inverse). It does imply If not B then not A(contrapositive).
If you believe and are baptized then you are saved Does not imply If you do not believe and are not baptized then you are not saved.
unless A then not B is linguistically equivalent to if -A then -B .
if B then A is logically implied.(contrapositive)
unless you repent then you are not saved.
is equivalent to
If you do not repent then you are not saved
Which implies
If you are saved then you repented.