Areligious group that is at odds with the dominant religion and culture and is usually headed by a charismatic leader is a
ward
cult
cell
sect

Cult

Explanation:

We can define cult in a few different, but similar, ways:

Cult is "a system of religious veneration and devotion directed toward a particular figure or object."

Cult can also be defined as "a relatively small group of people having religious beliefs or practices regarded by others as strange or sinister."

And finally, a Cult can also be: "a misplaced or excessive admiration for a particular person or thing."

All the 3 definitions seem to nicely fit the premise in the question.

d! i hope u get it ! xddd