Why should agnostics fear something we have no insight into and no way to measure? Maybe not having a kid will cause mean space aliens to suddenly appear and to

Why should agnostics fear something we have no insight into and no way to measure? Maybe not having a kid will cause mean space aliens to suddenly appear and torture everybody just for fun. Maybe suddenly converting to a religion actually feeds mana to an evil deceptive god who will then have enough believers and power to institute an eternal afterlife of torture. Whoops. Maybe the afterlife is just one eternal playground-buffet-orgy-concert-Twister game that only gets better the more players you have in it and all the agonistics should be convincing everyone to have more kids, all the time. Maybe it's just not a big concern with so many bigger issues to worry about in this life, like how to actually feed your kids and give them happiness and knowledge and wisdom and all that jazz, before they get anywhere near the afterlife. It's already a lot of work to raise them well for 18 years. Parents of any sort can't be responsible for their kids for all of what, five billion eternities. If there's an afterlife, well, I can only hope daycare costs are cheaper there.