Los Angeles Times October 10, 1992, Saturday, Home Edition SINEAD'S ACT ON 'SATURDAY NIGHT' It amazes me that people wouldn't understand Sinead O'Connor's dramatic offense on "Saturday Night Live" ("Catholics Ask NBC for Apology Over Sinead Act," Oct. 6). Her statement against the Pope immediately draws to mind the official Roman Catholic stand on birth control and against homosexuality. As a Catholic, I agree that the official position of the church in these areas is narrow, even dangerous. Having recently lost a dear friend to AIDS, I am all too acutely aware of the pain caused to my gay friend by church leaders' remarks. That the end of his life was pained by institutional bigotry pains me. The debate within the church just accelerated with O'Connor's remarks. This is ultimately good. And I'm glad that in America a punk like Sinead O'Connor has the right to say what she thinks, offensive or not. MONICA REX