The Michael Myers movie is purely fictional. It's a product of the imagination of the filmmakers to scare and thrill audiences, not based on any real events or people.
Yes, it is. 'The Blind Side' is based on the true story of Michael Oher. His life story, from a difficult upbringing to finding a family and success in football, was depicted in the movie.
Yes, he did. Michael Ende was reportedly unhappy with the film adaptation for various reasons related to its departure from the spirit of his original work.