I've always felt that her 'Christianity' was exceedingly nominal. It was really a pose (on the part of the writers, that is) for criticizing an institution from within, the TV sitcom equivalent of an FR 'disruptor.'
Meanwhile, out here in real life, no Christian church is running ad banners beneath the pastor's sermon.
Is (was) she really supposed to be a Christian on the show? If so, I never knew that. Again -- I only ever watched it a few times, but I just thought she was supposed to be the typical little brainwashed public-school socialist, who gets all the answers "right," according to what her teachers had programmed into her.