Once one admits that God's existence is undecidable, s/he can either live in fear of both possibilities or live free of both possibilities. Having no use for unfounded fear, I personally much prefer the latter option. God, if it exists, is irrelevant. Any spiritual activity I perform is for my own benefit and for the good of those around me, never for the consideration of a possible being that couldn't be bothered to manifest itself and make clear what its moral rules (if it has any) actually are.