Basically, using whatever measurement system you choose their is the best possible outcome after cost benefit analysis.

Aka if religion Alpha offers the best possible tangible outcomes using whatever metrics you are bashing this choice on and it also offers the best possible unknowable outcomes then their is little reason to pick anything else. By tangible rewards/costs I mean things that could be theoretically verified like joy, physical fitness, social acceptance, positive legacy etc. and by intangible rewards/costs I mean what the gods / spirits / whatever think of you, what happens in the afterlife etc.

Essentially it’s only if you rank religions by tangible rewards and intangible rewards separately and end up with a different first place that the intangible rewards become an issue.