Kasdeya is right in saying that the 'divide' is mostly in how you choose to explain your identity. It's also not a really strong 'divide' here on Kinmunity; for example, I understand my kin identity in both spiritual ways and psychological ways.
I know for a fact that my neglectful home environment as a child led me to live more in my head than in the material world--I felt shunned and ignored, which caused me to miss the phase of Identifying-With my family, cultural, and species group. Because I did not identify as a white human from kentucky in a christian-cultural region, I had to fill that void with something else--at the time, even though i did not use those words, I was Alienkin. Psychologically, I know I did not Fit In Here: There fore, I Must Be From Somewhere Else. It took on a spiritual element as a mythology of HOW an alien become a young human girl.
I'm also just generally a spiritual person and have my own personal religion. I believe that my Goddess has made me in her image, as I am an expression of Her Infinite Forms. She has made me a human body to live in this human world, and has given me contact with my Elven/Fae/Spiritual soul so that I will awaken to my true duty as her Servant. In this way, I see "Elf" and "Fae", my kintypes, as symbols for why she has made me this way and symbols for what my task is--to serve Her body as planet Earth and Nature.
Somebody with a different life path and a spiritual outlook similar to mine may have different symbols for their holy duty on this planet--for example, I have a beloved friend whose social role is to be a trickster. He reminds people around them that their beliefs are not solid stone and that they need to double check their priorities and whether they are doing the right thing by shining a rude, joking light on their assumptions. If he knew of kin, I am fairly certain he would be Coyote and Faekin. He's a spiritual person but does not follow a rote religion because structure chafes him lol.
There are others whose spiritual perspective on their kintype is more that they have been reincarnated in a sequence of lives, and sometimes another life of theirs very strongly influences this one; usually implying that their Soul is wise and is giving them "wolf flavor" or "cat flavor" or "dinosaur flavor" or "unicorn flavor" or "car flavor" or "cartoon-character flavor" in order to give them tools and perspectives to live This Life in a way of spiritual benefit. Or--it could also just be unintentional, and that's just how reincarnation works, and it's not to "live a better life for the Soul"! Depends on the person.
A person with a more psychological perspective on their kintype may say "Well, it clearly makes sense that my kintype is a shark. I have a cutting wit and a need to explore and wander, and I love depths and mystery and the simplicities of Not Knowing What is Below, and mammal-like people don't always understand me. I really really really feel like I AM what a shark represents than what a human represents." Or "I just get so many recurring memories of being a dog. I really feel like I'm THERE when I have these memories, and it shows up a lot in my everyday life. I can't beat this feeling that I AM this dog I keep thinking of or remembering." <--That one is an example of a non-spiritual perspective that includes dreams or memories of a different lifetime without a reincarnation belief requirement.
You don't have to know Right Now And Forever the origin and mechanisms of your kinness. Those may change over time--for example, I was originally SOLELY spiritual about my kinness, but over time have understood more and more the psychological influences on my awakening and kintypes and perspectives. Just pay attention to your experience and abandon all "shoulds." See what's really there when you remove pretenses and observe your experiences. You may find that you FEEL catgirl kin, but that the word "catgirlkin" doesn't seem to fully convey how you feel about your experiences--you don't have to use any certain words. For example, I don't like "elfkin" for myself. I like "of elvenkind", like a cultural description. I'm cool with faekin though! It just takes listening to your unique life.
Good luck and please ask any further questions around the forum! You don't have to have yourself 500% figured out to enjoy your time here and the community.