Which probably seems like a totally sensible response to Iomedae, and Evelyn feels terrible being frustrated at her about it, but she is frustrated. How is that not even worse! Now Lily will be disappointed when she inevitably doesn't get "picked by God" to be a "holy warrior." Also this part isn't Iomedae's fault, exactly, but Lily has a terrible time sense and probably expects to get picked by God next week if she manages to be good.
The problem is that everything Evelyn wants to say is probably going to go over disastrously. She wants to say that not everyone is very religious, and that's okay, and no one should try to argue with Iomedae about her faith but also Iomedae shouldn't pressure other people into being as religious as she is. She wants to say that Lily has never even been to church and was doing just fine before this without ever thinking about God. She...is pretty sure Iomedae will be somewhere between politely befuddled and outright distressed and indignant about that, because in the world of Iomedae's childhood, God is the one who gives you water and makes you immune to disease (though apparently decided not to do anything about her sick siblings?) and dying in God's service isn't even a tragedy because you go to Heaven, but going to Hell is pretty much the worst thing that could happen to someone.
She has no idea how to simultaneously be respectful of Iomedae's deep and genuine faith, and also convince Iomedae that she shouldn't indoctrinate Lily into her family's fundamentalist beliefs.
She wants to say that modern America is a secular society and some people believe different things about God, or worship God but don't believe in Jesus, or even worship entirely different gods, or are Buddhist and - wow okay she remembers like 1.5 things about Buddhism but she's pretty sure they don't really believe in God, just the cycle of karma and rebirth or whatever - and some people don't worship anything at all, and that's fine and no one should go around judging anyone else. Honestly that is a conversation she needs to have at the very least before Iomedae starts school, and she has no idea how Iomedae is going to react, but it's really not a conversation she wants to navigate in ten minutes over a dishwasher while Lily is watching cartoons in the other room.
She wants to say that Iomedae's family's religion is unusually...intense...even for Christian churches, and most people who go to church still don't believe that God miraculously heals people or sends them visions to be holy warriors, but it feels like that also falls into a slippery morass of conversations she doesn't especially want to have. In hindsight, Evelyn could really have seen it coming that taking a placement for a very religious child would mean having a lot of awkward conversations about religion.
Okay. Focus. This doesn't have to be a huge philosophical dive into comparative religion, which is a conversation Evelyn is deeply unequipped to have and she should point Iomedae at a...priest, or something. They do have to have another conversation about how to avoid making things really weird at school, but that's not this conversation and will be a lot easier once Iomedae has more vocabulary. All this needs to be is a conversation about Lily, Evelyn's foster child, and what she needs to be healthy and happy. Evelyn really ought to be qualified to have that conversation.
She chooses her words carefully.
"I think that if Lily sees you worrying about whether you're - as good as God wants you to be - then she's going to worry too, because children are sensitive and they learn how to behave by watching their grownups. . And - I know your family did things differently - but personally, I think children Lily's age shouldn't hear things about Hell, just like they shouldn't - um -" her go-to example of something that kids do not need to know about at age seven is the Holocaust but, once again, way too much context, "- watch violent television shows where a lot of people die. Because you need to be mature to - understand it, instead of just being scared and sad and confused about it. I think some seven-year-olds might be mature enough, and maybe you were, but I think Lily isn't."