House Run or not, Massive Church Organized or not, I'm sure there is still some kind of Religious Following amongst the population, it's likely a minority of the populations, but still I'm sure there are those people.
Don't get me wrong, I'm not a fan of Organized Religion really, But I don't think altogether that it would completely just..disappear from the minds of generation of generation of humans in Sirius, sure they're less Religiously aware, that's almost a fact, but there -must- still be believers, in whatever respective religion it is that they choose to follow.