The same as any other of the Abrahamic Religions.
The majority of those who practice have a positive influence, unifying people, providing support, and helping their community.
There is also a fairly large group of extremists, or orthodox practicers, that have a negative influence, by contesting that their form of worship is the only correct one, and generally preaching theocracy, bigotry, and other socially destructive practices.
The smallest groupe would be the violent extremists. The religiously motivated terrorists that all all Abrahamic faiths seem to produce along the fringes.
Very difficult to make a generalized statement about any religion. Too many different kinds of people practice.