Alright, I've been deep in the fantasy and mythological fiction trenches for ages, and the 'god of life' trope is a tricky one because it often gets blended with nature deities or healers. A pure life-god archetype is surprisingly rare in a standalone protagonist sense. Most of the time, they're side characters because their power set can make conflict resolution too easy, unless the author gets creative with the cost of that power.
One that immediately comes to mind is 'The Invisible Life of Addie LaRue'—no, hear me out. While not a traditional life god, the central deal with the dark entity grants a form of enduring, remembered existence that's a twisted reflection of life-giving. It's more about the essence of being alive than creating life. For a more direct take, Lois McMaster Bujold's 'The Curse of Chalion' features the Bastard, one of the five gods, whose domain includes, among other things, the fertility and randomness of life. The theology in that series is so thoughtfully crafted it makes you reconsider what a god of life's portfolio would actually entail.
Then you've got the 'Inheritance' series by N.K. Jemisin. The gods in those books are embodiments of natural forces, and while there isn't a singular 'life' god, the way Jemisin explores creation, rebirth, and the cyclical nature of existence through characters like Nahadoth touches on the core of that concept. It's less about healing scrapes and more about the raw, terrifying power of generating life from nothing.
If you're willing to stretch into web serials, 'The Wandering Inn' has a Death of Life and a Life of Death, I think? The afterlife and healing magic systems there play with the duality constantly. I keep hoping someone writes a novel where the god of life is the antagonist—imagine one who is so obsessed with preserving life that they prevent any natural death, leading to a horrifying, overgrown stagnation.