I am coming late to this but I am unaware of any Muslim group that rejects Khadija as the first convert The story of Muhammad s reception of the first revelation and his immediate flight in terror to hide weeping beneath Khadija s robe is a beloved tradition While the authenticity of the many ahaadith is debated this event is considered a crucial part of his revelation I think the introduction According to Muslim traditions perfectly suits this situation given that the event is only recorded by Muslims I would be interested if anyone knows of a competing tradition because admittedly this is not my speciality Also Happy Mevl t to y all smash