Demon's are fallen angels.
Depending on what interpretation you go with anyway, pretty much yeah, that's how it began.
Angels are naive, knowing only enough to function while otherwise operating as beings of purity and light. They are not Worldly, of this Earth, so they reflect none of it's needs. They are like children, confused by the things humans learn as the grow older.
...until they visit for too long, this place has the means of corrupting even God's agents thanks to Satan's twist on wisdom. Even in religions outside of Christianity, many refer to life as some form of suffering if not a trial or test, and in said suffering it is natural to seek a release from it... even for Angels it'd seem.
The nature of this world is a chaotic hunger, and all who come here begin to align with it. Interesting how God would allow for something like that, it goes beyond the claims of 'Free Will'. For what purpose He has for orchestrating Lucifer's fall by telling him he was "The Best", an Earthly value, is beyond me.
My spirituality entails putting what's suggested of us into practice. Not just blind faith. That triggers you to a point where you demand that faith is all you need, as if we should only have faith and nothing more. That in my opinion is madness.
That you'd even say that shows how much Earthly Values have tainted your perceptions. From there further decay upon your faith is possible.
The bible uses armor symbolism for a reason, and many passages on how wisdom is meaningless and the use of martyr symbolism to push slave morality. You aren't meant to be a master of your domain, you're meant to be God's pet, and He's pretty strict about disobedience.
It is a path of surrender to reality's boss, in spite of His questionable qualifications at this point of the narrative, but at the end of the day all He really wants is your faith... in the form of strict obedience to His laws.
To do otherwise gets us thrown into his trashfire, but many fallen angels do agree: It is madness.
Not just believing, but becoming.
It's not worth it dude, even you're already making allowances for Satanic principles based around Worldly desires.
You won't find a Christian who does it all correctly, hence why only 144,000 make it to Heaven at all. It's highly unnatural to not reflect this world unless you're deeply dissociative, which is why this religion (and many others) beg you to ignore the world in favor of faith.