"if a believer were to believe in God merely to fill in the gaps, they wouldn't be a person of faith."
See now. This is where I have something to say - in between giving the kids alcohol poisoning.
I am a proud supporter of Manchester City. I know I do not do it to 'fill in the gaps', I do it because it is the only right and proper thing to do. Doing so fills me with pride, love, and sometimes, an oceanic feeling of oneness with... stuff. I have been known to practice observances that are meaningful and symbolic to me and others and I pray regularly for them.
I believe I have always known this. And I grudgingly respect the similar feelings of others to feel the same about, say, Manchester United. Even though I know they are wrong in their beliefs.
And it was ever so.
You will think I am mocking (and actually, I'm not, but I am allegorizing, if that's a word).
Because my metanarrative is society. Reductionist, perhaps. I learnt it this way, however it feels (the problem of agency). Social facts exist and sustain, as Durkheim said, outside of consciousness.
Marx, of course, said the same about class consciousness. The evidence that belief in divinity was ever so only confirms my humanist sociological reductionism: yup, societies find it easiest to explain problems of theodicy in terms of things we can't see. As, in fact, does science.
And despite that, it still feels pretty bloody meaningful to believers. Not just feels, is.
And for that reason, I respect people's right to belief and faith, because I think social structures are valuable and meaningful. But I would still explain them in Englightenment terms, as someone else said earlier in the thread. Kant asked us to use knowledge to free ourselves from being dominated. I happen to think that a universalistic atheistic knowledge (in general, not just scientific) is valuable for those reasons.