Religion offers comfort, solace, community, etc. The churches who exclude lose members of their parish to those who include. Since not one religion has evidence that their brand is any more "correct" than another, it is definitely a sort of "market economy." If Church A doesn't offer what you want, go to Church B that does. And that's what we are finding is happening today. Culture and society are not stagnant -- they change over time. Churches that don't adapt with the zeitgeist ("spirit of the times") will gradually fall by the wayside.