my dear friend, most religions do this in some form or other.
go thru the history of religions in a balanced mind, you will understand most religions have done this. one group of men suppressing other group has ALWAYS been the case with humans (even some animals exhibhit this trait):
- In the middle ages, the church was the supreme in europe and countless people have died at the hands of church; galileo was threatened; copernicus was afraid to publish his book; and countless stories are there. - You know the count of american-indians killed in the name of 'americanization' ? - Moslems have killed others just because others were not moslems and even now Iraq is suffering from a great sunni/shiite divide. - Buddhists too have been involved in politics now and then - In fact the non-religious Communism has a greater history of suppressing others and killing others.
Face it friend, its the basis of human nature. blaming religion for this only shows the short-sightedness.