@thisishowloween
If they're not all knowing or all powerful, what are they? And why are they considered deities?
We consider them deities because in pagan polytheist philosophy being all-knowing and all-powerful are not innate properties of being a deity.
Your exposure to Christian monotheist concepts of what a deity must be has led you to think that something must be X in order to be considered a deity. But that is an Abrahamic monotheist idea. Why should it be held up to be the absolute definition of a deity?
In pagan polytheism, the gods and goddesses are seen as disembodied conscious beings who typically have the highest level of power and influence out of all the other myriad spirit entities - spirits of the dead, elemental spirits, nature spirits, etc, etc. But they are not all-powerful or all-knowing no.
They are still deities, because omnipotence and omniscience are not required properties in order for a spirit to be a deity.
How are people supposed to know about them form a relationship?
Most people (at least in the West) by the time they reach adulthood, are aware of the existence of many of these deities as a concept. People have some awareness that there are pantheons of Greek deities (Zeus, etc), Egyptian deities, Norse deities, Celtic deities...the majority of people are aware of at least SOME. They just don't believe they exist, because monotheism and atheist are the dominant perspectives in the West.
But people are aware of them. In order to form a relationship, though, they need to grant the existence of these deities as a possibility. Then they can make an approach to the deities themselves and initiate things. Make contact. Meditate, develop their psychic skills so that they can learn to perceive information from spirits, pray/speak to the deities...
So they're essentially not arsed about anyone who isn't fortunate enough to have discovered them and who isn't able to provide them with gifts.
If someone reached out to them and was genuinely unable to provide them with gifts, then the deities would understand, I think. And the gifts that polytheist offer are not necessarily vast - I might offer some milk and honey or a glass of wine and bit of chocolate - I should think those are easy enough for most people to offer, unless they are in absolute poverty.
But yes, the deities, as I (as a pagan polytheist see it) are not bothered with people they don't know. There's no reason why they would be. Because loving and caring about the whole of humanity is not an essential property of being a deity.
This is where a quote from another of John Beckett's posts (to highlight my point) comes in handy. It's from this one:
https://www.patheos.com/blogs/johnbeckett/2022/01/what-is-seen-cannot-be-unseen.html
"Spirits do not exist to “help” humans
Even those who accept the reality of Gods and spirits often have their foundational assumptions challenged. They find that fairies aren’t what Disney told us they were. They learn the spirit world is full of persons doing their own things for their own reasons, some of whom are ambivalent at best when it comes to humans. They find that Gods have Their own agendas and your comfort and safety aren’t very high on them.
In other words, they learn that life isn’t all about us."