AITA for bringing my brother back to life?

So I, Z(400+M), have a little brother N(400+M). When we were little kids, our village was attacked by dragons and N was killed. I really love my brother a lot and I couldn't bear that loss. Now I admit that I could have dealt with the grief in a healthier way but I decided to bring my brother back to life. I started researching and experimenting with forbidden death magic in order to find a way to revive N. Along the way I got cursed by God and created a cult of followers. Due to my curse I am now immortal and kill anyone I care about. Finally after a few decades I managed to revive N as a demon . I also sent him 400 years into the future so that he could become strong enough to kill me. Now I have declared a war against his adopted family and my brother is opposing me and saying that he hates me. I don't get how he can even say that. Everything I did was because of my love for him. AITA for loving my brother and reviving him?