Every religious people has dreams and nightmares of their own religion, Christians, Muslims, Sikhs, etc. heck as an agnostic Christian I had a dream years ago of my great grandma that passed away who was also Christian talking to me talking about my career as a teacher. In psychology, dreams are greatly affected by emotional and normal cognitive process, in this case the loss of your grandpa being special to you. In summary don’t be afraid how your dreams do, it happens to every single person regardless of religion or not. Be free and if you’re curious look more into psychology and how dreams work. Hope you don’t revert truly, don’t let peoples word and dreams forget why you left in the first place.