Hi: Satan has done so much for me, making a complete list could be much, much longer than you can imagine, I have never met a being who was so much on my side, who truly loved me and who truly believed in me when no one else was willing to do so, not even myself. Not to mention all the times he literally saved my life and put me in motivating situations where I was pushed to become the best version of myself.
But the thing I will ALWAYS be grateful for and is the thing that really made me cry (I hardly cry. Except when I see animals and children in pain, but other than that it is literally impossible to make me cry), that is when he saved the life of the girl I love. How I would like to go and tell her that it was Satan who saved her, obviously she would never believe me, but it makes me laugh at how when she describes her experience she uses expressions like "I truly felt blessed", "it was a miracle", etc. Satan really cared so much about me.
He did everything he could to create the best Father-son relationship possible. Therefore, it would be impossible for me not to feel all the love I could for him. It really bothers me when someone comes out with offensive expressions towards him (I live in Italy and anti-Satan expressions are common because of the Catholic Church).
Knowing everything Satan has done for me, hearing him slandered really makes me angry in more ways than one. Since he saved the life of the girl I love, I literally can't stand people who attack him for free. I still tolerate the ignorant victims of Christian doctrines, but when someone feels they have the right to offend him in an exclusively gratuitous way as if they suffered from Tourette's syndrome or some obsessive nervous tic, I simply walk away.
Satan is everything to me now. To say that he is a Father for me is to want to minimize. Satan is the most perfect expression of the universal idea that one can have of a Father. For me, that's how it is. With all the qualities that a good Father who truly loves his son should possess. I know these seem like abstract things, but if I actually had to tell you all about them in detail to make them concrete, I would need at least a few pages.
BUT, I'll give you this link to various experiences that people have given over the years and that were collected a long time ago on the Joy of Satanas site. Here you go: