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Creationism is the religious belief that life, the Earth, and the universe are the creation of a supernatural being.
While all spirits know/believe this to a certain extent, it is quite a bit more complicated than this idea.
Spirits maintain nature (moon, sun, seasons, childhood, etc., etc.) when they are chosen. Although they may be able to control some aspects of it, the majority of it is created by the natural process of the world, and is not the result of any spirit.
Who chose Man in the Moon and Mother Nature… well, no one but the ones involved know.
The spirits' "religion", if we can call it that, is a strange mix of creationism, mentioned above, Taoism (or is it Daoism?), where everything is balanced, science, and their own knowledge.
There are a few who stick a few more religious beliefs in, but this is the basis of all of them.
Every spirit is created for a reason: to bring balance. This is why we have Pitch Black, the Boogeyman, to bring fear and the Guardians to bring belief. Without fear, there is no belief, and vice versa.
The seasonal spirits were created for the same reason.
For the longest time, winter was the only season without a spirit, and thus, the world was unbalanced. But it was so used to being unbalanced that everyone in it thought it was balanced.
Contrary to many people's (and spirits') belief, winter was and is necessary. It always has been and always will be.
You see, way back when, back before air conditioning and houses and well, most of modern technologies, really, when the wheel was still new, people were farmers or hunters/gatherers. They might've bartered for something they needed, but they had a system that was more heavily based on weather.
Now, tell me this: if we were farmers, and there was no weather that killed crops, other than droughts or too much rain, what would happen?
Here's what very, very little people/spirits know: unbalance. The crops would've flourished at all times, then the soil becomes infertile from being overworked, and we move on to new places, because droughts could be fixed with irrigation systems. And the same thing happens, and continues happening, and then no more plants can grow because we used up all the soil, and thus, have killed our planet for a good two billion years or so. Also, we would kill ourselves from working too much. Double whammy.
Winter was a time for rest. It killed crops and wild plants and froze over the ground, not to demonstrate power, but to ensure that the people wouldn't attempt to overcome the balance they were unaware existed.
Winter is not death, and whoever the heck came up with that is an utter moron. Humans have brains, they didn't use theirs; otherwise they would've noticed that winter is sleep, not death. The land wakes up every spring.
Seriously, you guys. People and plants die in every season, and whoever said the world revolves around us?
Jack Frost was born of balance. He is the first and only spirit of Man in Moon and Mother Nature. He is the balance between seasonal spirits and moonlit spirits, as the spirits of the Moon are called. He is literally created of balance, showing the purpose of winter, of rest, but also showing that it can be a terrible force.
He'll tell you that although he may fight on the side of angels, he's not one of them, and if he's feeling particularly honest, he doesn't want to be one. He's perfectly fine being in limbo, thank you.
Unfortunately, many spirits think that Jack upset the balance that was created and were furious and confused as to why the heck another spirit wasn't made to counter Frost.
So they did the one thing they knew. They knew the boy longed for someone to acknowledge him, so they left him alone. For 300 years. In silence.
Man in the Moon and Mother Nature practically drained all their resources to make Jack, knowing he would have two enemies- Pitch and Summer (though the spirit was actually a good friend of Jack's… eventually… winter was the opposite of summer, therefore, it was the whole Yin/Yang deal). They practically made him the most powerful spirit because they had to; else he would've been dead for good a long while ago, for he would have the strength of one and have to fight off two. Not exactly equal, is it?
Eventually, the other spirits would come to understand this and would welcome Jack into their ranks, but he was still a bit cold to them (pun somewhat intended). After all, you don't just ignore a guy for three hundred years and not even listen to his side of the story without leaving a few scars, for the scars that you can't see take the longest time to heal.
Some never accepted Jack. He understood.
Winter is necessary, so is fun. Jack embodies and emphasizes both; therefore, he too is necessary, contrary to some spirits' and people's beliefs.
The world is a better place with snowballs and fun times.
A/N: Ow. Ow. FREAKING OW. Yes, I know, work on other stories, stop doing things painful to your screwed up wrist, yes, yes, I know. Unfortunately, I'm not that great a listener.
Idea stemmed from something I made up a long time ago- winter's purpose.