SecularFrummy: Who says all else is lost? There’s a phrase, “Mitoch lo l’shma, bo l’shma” – if you do something that is not l’shma, eventually, you’ll do it l’shma. So even if someone’s doesn’t have full faith in Hashem, they can still do things which can eventually bring them to a full belief.
Even if it does hinge on that, so what? Does that mean it shouldn’t be a test?