It's not hard. Any church the preaches that we are saved by grace alone, through faith in Jesus alone.
Ron Boatright holds that the Protestant denominations, in addition to the Catholic/Orthodox denominations teach a false doctrine of salvation. Below are brief descriptions giving where and when each of the denominations listed began and who started them. Also given are some of their basic beliefs especially what they falsely teach and practice that one must do to be saved.
Do you agree with him ?