Sorry Monty I actually don't know, I think I got you mixed up with someone else - apologies 
& Dionne is right, I've seen countless so called "Woo" threads derailed by the self righteous harpies who insist on forcing their own view down everyone's throat - it's never a debate because they don't know how to listen
it's attack & mockery thats all, not a debate.
Personally I hate drum banging religious zealots, but take away the religion & I see no difference to the behaviour of some posters here - how can you challenge something you have absolutely no experience or understanding of, you simply fly in from the point if complete ignorance & presumptions & piss all over the thread - surprised its not a cloud if black feathers floating around right now as you drop them in your feeding frenzy 
& why are you so arrogant to insist that you have a right to "challenge" others beliefs
- you don't! No one is interested in your opinion - it's all in the thread title AIBU or not, you would still be playing the same silly game if it were posted elsewhere & you know it
I will answer a question though, but more for the purpose if real debate, as opposed to your bombastic nonsense.
Of course I don't believe the feathers are actually from an angel - how ridiculous to think that, if it were true then they would be gathered up & put under a microscope until they were analysed to dust.
But rather they are a gift one with a spiritual connection meant to bring comfort, protection & strength, if someone buys me a gift I don't feel the need to demand to know where it comes from, I simply accept it gratefully in the spirit it is given - that's all.
I do feel the need to make it clear though, my own experience with this phenomenon isn't just about grieving - yes it's become part of that recently, but for me it's something I have experienced all my life, it sent taught to me, it was just there & I've experienced so much "woo" in many forms that I just cannot go back to not believing & trust me I do analyse, some experiences I would much rather find a logical explanation for, because is not all positive stuff, but I can't deny it, that would be lying o myself & I'm way too long in the tooth for that.
But this is positive, very positive & it has probably saved my life on occasions too - for example I was once walking home across a common along side a road - it was quiet, not much traffic at all, lovely sunny day & I w enjoying the walk - I suddenly heard an urgent screaming in my head - JUMP, JUMP NOW - & I don't know why, but I did jump - I jumped & felt myself dragged & lifted too - it all happened in a split second - I ended up rolling head first onto the grass
& I then realise that a car had left the road & hit the tree right where I was standing a few seconds earlier - I would have been crushed without doubt - I took off my glove to check my fingers as they hurt - & there in my hand was another white feather - someone, or something was looking after me that day
Turned out he car had gad a blow out, the woman driving was thankfully okay, though her car wasn't so good, I had not at any level seen that coming.
So it's not just a grief coping mechanism for me, but it has been a positive part of my life for as long as I can remember -
I could tell a lot more stories, but it's a bit like been cornered by the school bullies & telling them all your secrets - why do that when some people only intend to be negative & take the pee - no point
I do understand that your experiences are different to mine though & understand that it can sound barking mad if you have never experienced anything, that just cannot be explained in any normal, logical scientific way, so I don't expect you to believe me, nor do I need that from you or anyone, I respect your right to not believe & completely understand why to you it is so "woo" that's perfectly fine by me.