Part of the issue is probably that lots of people really don’t follow politics or the news. Surveys of Americans’ basic politics and current events knowledge show that there’s a majority of the population that has no clue what’s going on.
The comparison Steven brings up is interesting: why do conservative Christians leave their churches when they go gay-friendly but liberal Christians don’t leave their churches when they’re homophobic? It’s important to acknowledge that are some who have left their churches over homophobia and sexism, even if they’re straight and male.
But then there are the many others, who like watching Glee but will never actually leave their churches because the latter is too big a step for their level of care.