I lack the context in which your comment makes sense as a counterargument or response to what I said. My argument is that they are worse off. You imply otherwise on the basis that they seem to try harder at one facet of life.

Assuming that: religious people not only seem to put more effort into family, but do, and assuming this is true either on average, as a non-binary sliding correlation, or in some other significant way, and assuming that religiosity drives this, rather than this correlation being driven by a third factor, and assuming that it isn't having kids that causes religiosity, and assuming that the effort spent into family produces happiness at least as effectively than atheists produce it through their sundry efforts...why also assume that religious people would only (seem to) put that effort into family if it made them at least as happy as atheists when their religion itself is demanding that they do so on pain of ostracization and hellfire?

Citation needed, I think. Also separate "seem to put more effort" from "have better family life"; seeming to put more effort in doesn't always means getting better results, but in your sentence it still appears to score points.