This is a question I wrestle with as well. I've had a couple of very interesting answers, but there's also a lot of ambiguity, some that i do not understand yet.
Background: raised in the church, served a two year mission as a young adult, very picture perfect Christian boy. But I also struggled with a DL fetish in private since puberty. It was a way of expressing sexual urges that felt like a loophole, because "it wasn't really porn."
A few years later, I did realize this loophole was still against teachings of chastity, which is where the binges and purges started.
After a few years of that, I gave up. I decided to go hedonist, bought several kinds of diapers, and went on a road trip where I was basically 24/7. Went to a local ADBL event or two. Even wrote several pieces of smut.
But a year later, I realized that wasn't quite making me happy either. So that started something of a gentle purge, motivated by wanting to become a more eligible bachelor and future partner. I had time and money after finally graduating from college, so I could pursue romance. It wasn't a purge of shame, it felt more like I was choosing to set them aside for something I wanted more. This could be compared to a diet; cake is yummy, but bring able to fit in jeans was a better goal.
I worked with a therapist for a few months, figuring out that my attraction to diapers wasn't inherently evil, and that I had learned some very important lessons about sex along the way. (Consent and mutual satisfaction, mainly)
But that still left the problem that at least to me, diapers are like 90% sexual. And I can't simply make my sex drive disappear.
Well, a month or so ago, I had a very interesting impression while grocery shopping. I really can't describe the voice of the Holy Spirit in text, but it really felt like it was telling me to buy some Goodnites (I fit into the XLs.)
And after a few minutes of thinking, I did. There was very little anxiety compared to previous binges. And on my road trip, I was thinking about my fetish, and it didn't really distance me from God; He still spoke to me if I asked, even while wearing a soaked Megamax.
I think I've learned that God is okay with my diaper fetish, it's pornography that causes sin. Romance, love, and sex each have their own proper, beautiful place in His plan, and one I had experienced and understood that, then I was open to receiving fetishes having their own place and time. There's also probably a principle of balance to be considered as well. If it affects my work or relationships, it's gone too far.