Hello! I'm a Christian, and alienkin [alien otherkin]. Here are my thoughts regarding your post and my experiences:
[this post is written with a positive tone. I'm writing this, because it's often hard to get the tone of a text]
I am a human, but only physically. Since God created all beings, including humans, I believe that God created me this way, as I am: physically a human, mentally - a being from space.
Otherkinnity is not the want of my heart. It's actually something that I don't enjoy, I only enjoy self-expression. As a little kid, I often prayed to God because I was confused, lost. I was praying for answers about my weird identity.
And when I was 13 (I think?) I discovered the term "otherkin". My confusion got much less intense and I finally started to accept myself as I am. And now, as I'm writing this post, I've realized that maybe that was the answer that God let me see? There's still a lot of unanswered questions, but I'm grateful that I "stumbled upon" this term.
God created all: humans, animals, plants... So who knows - maybe His decision was to create beings that are "in-between"?
I don't really wish I was an alien. I am an alien, unfortunately. Honestly, I'd rather be a human enjoying life and self-expression than a suffering alien stuck in a human body. I could techincally lie to myself and convince myself that I'm fully a human, but this alien part of me will not leave.
But even through all of this crying and suffering, my faith didn't stop. I've had my ups and downs, but I believed - all the time. I am grateful for me being alive. I am grateful for being created by God. I do not know His plans for me. But I know that they're good and positive. I do not know why God has created me like this, but maybe someday - I will get to know this information.
This motivates me to be a good person, which is hard for me and with my conditions, but possible. I'm trying. Because when the day comes, and my soul will leave this world, maybe I'll get to know the answer to why am I like this. Or not. Who knows what will happen...
God is watching over me, you, and all beings in here. And someday we will meet Him. But I wish, for me and you, that this day will be in the far, far future!
I don't really feel like demons have an influence on my identity. I rather think that God created me as.. well, me, for a reason. What reason? I have no idea. I'm just a little being, and His plans are a mystery. But as I mentioned: I'm sure they are good.
And I agree, I will remain in this body until I leave. Transforming into an alien is not an option, heh. I can only do things that will make me feel better about myself, like self-expression through clothing or what I call a "transition" [which is rather some positive changes].
Sorry for the "text wall", but I just couldn't stop myself from writing it :] If you have read this, thank you for reading and, maybe even understanding a bit from my experience.
I hope that you have a good day, remember to take care of yourself!
[also: I do not feel "attacked" in any way, just wanted to share about me :]