It's a good example that encompasses both the mythology aspect of the Old Testament and a lack of historical and archaeological evidence. Beliefs don't really affect facts. Something is fact regardless of whether people believe it or not.
I believe the key here is to allow people to believe in the ethos of God. If they don’t, then the fact of God doesn’t matter to them.
If I didn’t believe in the ethos of God, I would at least stop and contemplate why not.