That isn't a point I'm making though - I'd simply like to understand how theists who believe in an interventionist, all-loving and good 'God' that they pray to are able to reconcile their beliefs to, say, the death of children from various childhood cancers.
It seems to me that their theistic beliefs are not a good fit with what happens to some small people.
It depends on the theist and their particular belief so I can only speak for myself.
If theists believe in a god that has the power to intervene but doesn't, I think theists just assume there is a spiritual reason for the lack of intervention.
My concept / belief is that there is a lot I can't know or understand about why things happen. Becoming a theist has not given me any more knowledge about why any particular event happened to me or someone I love compared to when I was an atheist.
As a theist I can frame my ideas in a different language but obviously I can't "know" in the demonstrable sense of the word any more than I did when I was an atheist. My theistic beliefs feel like a good fit with what I observe in the world, in so much as I think a lot of the stories about god are there to illustrate a view or perspective or lesson about life e.g. on ways you can manage your experiences and your reactions to experiences in the context of both believing in a spiritual aspect to our existence and creating some kind of moral guidance to navigate community interactions.
I have no idea what you mean by "all-loving" or "good" - there is no one standard meaning in morality and different people have different understandings of what "love" or "good" is or means to them, especially in relation to spiritual concepts and spiritual development.
I have different expectations when it comes to experiences of spiritual development compared to my expectations in a relationship with another human being.
I also have different expectations of relationships from a global community perspective to the ones I have for inter-personal relationships so while I won't shoot some stranger walking down my road, I did sign up for the army at university so presumably I was prepared to shoot complete strangers if required to, in that context of being part of a nation on the global stage. I have no idea if that makes me a good, bad or loving person - depends on your perspective I suppose.
As I said, I don't take religious stories literally, so that probably explains why my beliefs fit with the stories - I think religious stories are just a vehicle to convey a lesson or perspective in a particular situation or context that can also be translated to other situations, because story-telling can be an effective engaging way to to communicate with many people.