I feel ya, I’ve always been a mix of “not ready” and “not wanting”. Then my perspective on what fatherhood even is shifted and I was able to unshackle myself from the Christian thing.
That said, if you don’t want kids for yourself then what impact are you having on those 20 somethings when you soapbox about how difficult and dangerous the world is?
I love to uncle, too. I passed on military entirely and rejected workplace leadership for awhile, but aging into “older male” triggers that itch sometimes. I’ve always joked that I like to rent not own, now my friends have kids and I got bonus nieces and nephews. It sounds like yours do have someone looking out for them. Good job, man!