Star Haven (or thereabouts) gets my vote. A couple (and maybe also single parents and polyamorous arrangements?) wishes/prays to the Star Road for a baby, the wish is granted by the power of the Star Rod, and the storks fly down from the stars to deliver the magically created babies.
But now I'm thinking, are the Star Spirits (Eldstar et al, Twink, Geno) only deities for the Mushroom Planet? There's precedent for tiny local suns (SMB3 Angry Sun and the Flower Fields Sun in Paper Mario), so maybe the Star Spirits are kind of like that. That could explain how the theology of Paper Mario and Mario Galaxy can work together -- Rosalina creates the stars and planets and then she backs off and lets planetary deities take over. (Did Rosalina create any planets where sex exists?) (maybe this should be moved to the silly mario fan theories thread)